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diff --git a/node_modules/csso/lib/compressor/compress/Atrule.js b/node_modules/csso/lib/compressor/compress/Atrule.js
new file mode 100644
index 00000000..c5410ab9
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Atrule.js
@@ -0,0 +1,9 @@
+var resolveKeyword = require('../../utils/names.js').keyword;
+var compressKeyframes = require('./atrule/keyframes.js');
+
+module.exports = function(node) {
+    // compress @keyframe selectors
+    if (resolveKeyword(node.name).name === 'keyframes') {
+        compressKeyframes(node);
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/Attribute.js b/node_modules/csso/lib/compressor/compress/Attribute.js
new file mode 100644
index 00000000..99cafdce
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Attribute.js
@@ -0,0 +1,33 @@
+// Can unquote attribute detection
+// Adopted implementation of Mathias Bynens
+// https://github.com/mathiasbynens/mothereff.in/blob/master/unquoted-attributes/eff.js
+var escapesRx = /\\([0-9A-Fa-f]{1,6})[ \t\n\f\r]?|\\./g;
+var blockUnquoteRx = /^(-?\d|--)|[\u0000-\u002c\u002e\u002f\u003A-\u0040\u005B-\u005E\u0060\u007B-\u009f]/;
+
+function canUnquote(value) {
+    if (value === '' || value === '-') {
+        return;
+    }
+
+    // Escapes are valid, so replace them with a valid non-empty string
+    value = value.replace(escapesRx, 'a');
+
+    return !blockUnquoteRx.test(value);
+}
+
+module.exports = function(node) {
+    var attrValue = node.value;
+
+    if (!attrValue || attrValue.type !== 'String') {
+        return;
+    }
+
+    var unquotedValue = attrValue.value.replace(/^(.)(.*)\1$/, '$2');
+    if (canUnquote(unquotedValue)) {
+        node.value = {
+            type: 'Identifier',
+            info: attrValue.info,
+            name: unquotedValue
+        };
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/Dimension.js b/node_modules/csso/lib/compressor/compress/Dimension.js
new file mode 100644
index 00000000..e614ad08
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Dimension.js
@@ -0,0 +1,54 @@
+var packNumber = require('./Number.js').pack;
+var LENGTH_UNIT = {
+    // absolute length units
+    'px': true,
+    'mm': true,
+    'cm': true,
+    'in': true,
+    'pt': true,
+    'pc': true,
+
+    // relative length units
+    'em': true,
+    'ex': true,
+    'ch': true,
+    'rem': true,
+
+    // viewport-percentage lengths
+    'vh': true,
+    'vw': true,
+    'vmin': true,
+    'vmax': true,
+    'vm': true
+};
+
+module.exports = function compressDimension(node, item) {
+    var value = packNumber(node.value);
+
+    node.value = value;
+
+    if (value === '0' && this.declaration) {
+        var unit = node.unit.toLowerCase();
+
+        // only length values can be compressed
+        if (!LENGTH_UNIT.hasOwnProperty(unit)) {
+            return;
+        }
+
+        // issue #200: don't remove units in flex property as it could change value meaning
+        if (this.declaration.property.name === 'flex') {
+            return;
+        }
+
+        // issue #222: don't remove units inside calc
+        if (this['function'] && this['function'].name === 'calc') {
+            return;
+        }
+
+        item.data = {
+            type: 'Number',
+            info: node.info,
+            value: value
+        };
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/Number.js b/node_modules/csso/lib/compressor/compress/Number.js
new file mode 100644
index 00000000..8e17e118
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Number.js
@@ -0,0 +1,22 @@
+function packNumber(value) {
+    // 100 -> '100'
+    // 00100 -> '100'
+    // +100 -> '100'
+    // -100 -> '-100'
+    // 0.123 -> '.123'
+    // 0.12300 -> '.123'
+    // 0.0 -> ''
+    // 0 -> ''
+    value = String(value).replace(/^(?:\+|(-))?0*(\d*)(?:\.0*|(\.\d*?)0*)?$/, '$1$2$3');
+
+    if (value.length === 0 || value === '-') {
+        value = '0';
+    }
+
+    return value;
+};
+
+module.exports = function(node) {
+    node.value = packNumber(node.value);
+};
+module.exports.pack = packNumber;
diff --git a/node_modules/csso/lib/compressor/compress/String.js b/node_modules/csso/lib/compressor/compress/String.js
new file mode 100644
index 00000000..01a20a2c
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/String.js
@@ -0,0 +1,12 @@
+module.exports = function(node) {
+    var value = node.value;
+
+    // remove escaped \n, i.e.
+    // .a { content: "foo\
+    // bar"}
+    // ->
+    // .a { content: "foobar" }
+    value = value.replace(/\\\n/g, '');
+
+    node.value = value;
+};
diff --git a/node_modules/csso/lib/compressor/compress/Url.js b/node_modules/csso/lib/compressor/compress/Url.js
new file mode 100644
index 00000000..040a3590
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Url.js
@@ -0,0 +1,33 @@
+var UNICODE = '\\\\[0-9a-f]{1,6}(\\r\\n|[ \\n\\r\\t\\f])?';
+var ESCAPE = '(' + UNICODE + '|\\\\[^\\n\\r\\f0-9a-fA-F])';
+var NONPRINTABLE = '\u0000\u0008\u000b\u000e-\u001f\u007f';
+var SAFE_URL = new RegExp('^(' + ESCAPE + '|[^\"\'\\(\\)\\\\\\s' + NONPRINTABLE + '])*$', 'i');
+
+module.exports = function(node) {
+    var value = node.value;
+
+    if (value.type !== 'String') {
+        return;
+    }
+
+    var quote = value.value[0];
+    var url = value.value.substr(1, value.value.length - 2);
+
+    // convert `\\` to `/`
+    url = url.replace(/\\\\/g, '/');
+
+    // remove quotes when safe
+    // https://www.w3.org/TR/css-syntax-3/#url-unquoted-diagram
+    if (SAFE_URL.test(url)) {
+        node.value = {
+            type: 'Raw',
+            info: node.value.info,
+            value: url
+        };
+    } else {
+        // use double quotes if string has no double quotes
+        // otherwise use original quotes
+        // TODO: make better quote type selection
+        node.value.value = url.indexOf('"') === -1 ? '"' + url + '"' : quote + url + quote;
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/Value.js b/node_modules/csso/lib/compressor/compress/Value.js
new file mode 100644
index 00000000..8196ba82
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Value.js
@@ -0,0 +1,18 @@
+var resolveName = require('../../utils/names.js').property;
+var handlers = {
+    'font': require('./property/font.js'),
+    'font-weight': require('./property/font-weight.js'),
+    'background': require('./property/background.js')
+};
+
+module.exports = function compressValue(node) {
+    if (!this.declaration) {
+        return;
+    }
+
+    var property = resolveName(this.declaration.property.name);
+
+    if (handlers.hasOwnProperty(property.name)) {
+        handlers[property.name](node);
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/atrule/keyframes.js b/node_modules/csso/lib/compressor/compress/atrule/keyframes.js
new file mode 100644
index 00000000..74eff2c6
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/atrule/keyframes.js
@@ -0,0 +1,21 @@
+module.exports = function(node) {
+    node.block.rules.each(function(ruleset) {
+        ruleset.selector.selectors.each(function(simpleselector) {
+            simpleselector.sequence.each(function(data, item) {
+                if (data.type === 'Percentage' && data.value === '100') {
+                    item.data = {
+                        type: 'Identifier',
+                        info: data.info,
+                        name: 'to'
+                    };
+                } else if (data.type === 'Identifier' && data.name === 'from') {
+                    item.data = {
+                        type: 'Percentage',
+                        info: data.info,
+                        value: '0'
+                    };
+                }
+            });
+        });
+    });
+};
diff --git a/node_modules/csso/lib/compressor/compress/color.js b/node_modules/csso/lib/compressor/compress/color.js
new file mode 100644
index 00000000..cf2a3236
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/color.js
@@ -0,0 +1,489 @@
+var List = require('../../utils/list.js');
+var packNumber = require('./Number.js').pack;
+
+// http://www.w3.org/TR/css3-color/#svg-color
+var NAME_TO_HEX = {
+    'aliceblue': 'f0f8ff',
+    'antiquewhite': 'faebd7',
+    'aqua': '0ff',
+    'aquamarine': '7fffd4',
+    'azure': 'f0ffff',
+    'beige': 'f5f5dc',
+    'bisque': 'ffe4c4',
+    'black': '000',
+    'blanchedalmond': 'ffebcd',
+    'blue': '00f',
+    'blueviolet': '8a2be2',
+    'brown': 'a52a2a',
+    'burlywood': 'deb887',
+    'cadetblue': '5f9ea0',
+    'chartreuse': '7fff00',
+    'chocolate': 'd2691e',
+    'coral': 'ff7f50',
+    'cornflowerblue': '6495ed',
+    'cornsilk': 'fff8dc',
+    'crimson': 'dc143c',
+    'cyan': '0ff',
+    'darkblue': '00008b',
+    'darkcyan': '008b8b',
+    'darkgoldenrod': 'b8860b',
+    'darkgray': 'a9a9a9',
+    'darkgrey': 'a9a9a9',
+    'darkgreen': '006400',
+    'darkkhaki': 'bdb76b',
+    'darkmagenta': '8b008b',
+    'darkolivegreen': '556b2f',
+    'darkorange': 'ff8c00',
+    'darkorchid': '9932cc',
+    'darkred': '8b0000',
+    'darksalmon': 'e9967a',
+    'darkseagreen': '8fbc8f',
+    'darkslateblue': '483d8b',
+    'darkslategray': '2f4f4f',
+    'darkslategrey': '2f4f4f',
+    'darkturquoise': '00ced1',
+    'darkviolet': '9400d3',
+    'deeppink': 'ff1493',
+    'deepskyblue': '00bfff',
+    'dimgray': '696969',
+    'dimgrey': '696969',
+    'dodgerblue': '1e90ff',
+    'firebrick': 'b22222',
+    'floralwhite': 'fffaf0',
+    'forestgreen': '228b22',
+    'fuchsia': 'f0f',
+    'gainsboro': 'dcdcdc',
+    'ghostwhite': 'f8f8ff',
+    'gold': 'ffd700',
+    'goldenrod': 'daa520',
+    'gray': '808080',
+    'grey': '808080',
+    'green': '008000',
+    'greenyellow': 'adff2f',
+    'honeydew': 'f0fff0',
+    'hotpink': 'ff69b4',
+    'indianred': 'cd5c5c',
+    'indigo': '4b0082',
+    'ivory': 'fffff0',
+    'khaki': 'f0e68c',
+    'lavender': 'e6e6fa',
+    'lavenderblush': 'fff0f5',
+    'lawngreen': '7cfc00',
+    'lemonchiffon': 'fffacd',
+    'lightblue': 'add8e6',
+    'lightcoral': 'f08080',
+    'lightcyan': 'e0ffff',
+    'lightgoldenrodyellow': 'fafad2',
+    'lightgray': 'd3d3d3',
+    'lightgrey': 'd3d3d3',
+    'lightgreen': '90ee90',
+    'lightpink': 'ffb6c1',
+    'lightsalmon': 'ffa07a',
+    'lightseagreen': '20b2aa',
+    'lightskyblue': '87cefa',
+    'lightslategray': '789',
+    'lightslategrey': '789',
+    'lightsteelblue': 'b0c4de',
+    'lightyellow': 'ffffe0',
+    'lime': '0f0',
+    'limegreen': '32cd32',
+    'linen': 'faf0e6',
+    'magenta': 'f0f',
+    'maroon': '800000',
+    'mediumaquamarine': '66cdaa',
+    'mediumblue': '0000cd',
+    'mediumorchid': 'ba55d3',
+    'mediumpurple': '9370db',
+    'mediumseagreen': '3cb371',
+    'mediumslateblue': '7b68ee',
+    'mediumspringgreen': '00fa9a',
+    'mediumturquoise': '48d1cc',
+    'mediumvioletred': 'c71585',
+    'midnightblue': '191970',
+    'mintcream': 'f5fffa',
+    'mistyrose': 'ffe4e1',
+    'moccasin': 'ffe4b5',
+    'navajowhite': 'ffdead',
+    'navy': '000080',
+    'oldlace': 'fdf5e6',
+    'olive': '808000',
+    'olivedrab': '6b8e23',
+    'orange': 'ffa500',
+    'orangered': 'ff4500',
+    'orchid': 'da70d6',
+    'palegoldenrod': 'eee8aa',
+    'palegreen': '98fb98',
+    'paleturquoise': 'afeeee',
+    'palevioletred': 'db7093',
+    'papayawhip': 'ffefd5',
+    'peachpuff': 'ffdab9',
+    'peru': 'cd853f',
+    'pink': 'ffc0cb',
+    'plum': 'dda0dd',
+    'powderblue': 'b0e0e6',
+    'purple': '800080',
+    'rebeccapurple': '639',
+    'red': 'f00',
+    'rosybrown': 'bc8f8f',
+    'royalblue': '4169e1',
+    'saddlebrown': '8b4513',
+    'salmon': 'fa8072',
+    'sandybrown': 'f4a460',
+    'seagreen': '2e8b57',
+    'seashell': 'fff5ee',
+    'sienna': 'a0522d',
+    'silver': 'c0c0c0',
+    'skyblue': '87ceeb',
+    'slateblue': '6a5acd',
+    'slategray': '708090',
+    'slategrey': '708090',
+    'snow': 'fffafa',
+    'springgreen': '00ff7f',
+    'steelblue': '4682b4',
+    'tan': 'd2b48c',
+    'teal': '008080',
+    'thistle': 'd8bfd8',
+    'tomato': 'ff6347',
+    'turquoise': '40e0d0',
+    'violet': 'ee82ee',
+    'wheat': 'f5deb3',
+    'white': 'fff',
+    'whitesmoke': 'f5f5f5',
+    'yellow': 'ff0',
+    'yellowgreen': '9acd32'
+};
+
+var HEX_TO_NAME = {
+    '800000': 'maroon',
+    '800080': 'purple',
+    '808000': 'olive',
+    '808080': 'gray',
+    '00ffff': 'cyan',
+    'f0ffff': 'azure',
+    'f5f5dc': 'beige',
+    'ffe4c4': 'bisque',
+    '000000': 'black',
+    '0000ff': 'blue',
+    'a52a2a': 'brown',
+    'ff7f50': 'coral',
+    'ffd700': 'gold',
+    '008000': 'green',
+    '4b0082': 'indigo',
+    'fffff0': 'ivory',
+    'f0e68c': 'khaki',
+    '00ff00': 'lime',
+    'faf0e6': 'linen',
+    '000080': 'navy',
+    'ffa500': 'orange',
+    'da70d6': 'orchid',
+    'cd853f': 'peru',
+    'ffc0cb': 'pink',
+    'dda0dd': 'plum',
+    'f00': 'red',
+    'ff0000': 'red',
+    'fa8072': 'salmon',
+    'a0522d': 'sienna',
+    'c0c0c0': 'silver',
+    'fffafa': 'snow',
+    'd2b48c': 'tan',
+    '008080': 'teal',
+    'ff6347': 'tomato',
+    'ee82ee': 'violet',
+    'f5deb3': 'wheat',
+    'ffffff': 'white',
+    'ffff00': 'yellow'
+};
+
+function hueToRgb(p, q, t) {
+    if (t < 0) {
+        t += 1;
+    }
+    if (t > 1) {
+        t -= 1;
+    }
+    if (t < 1 / 6) {
+        return p + (q - p) * 6 * t;
+    }
+    if (t < 1 / 2) {
+        return q;
+    }
+    if (t < 2 / 3) {
+        return p + (q - p) * (2 / 3 - t) * 6;
+    }
+    return p;
+}
+
+function hslToRgb(h, s, l, a) {
+    var r;
+    var g;
+    var b;
+
+    if (s == 0) {
+        r = g = b = l; // achromatic
+    } else {
+        var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
+        var p = 2 * l - q;
+
+        r = hueToRgb(p, q, h + 1 / 3);
+        g = hueToRgb(p, q, h);
+        b = hueToRgb(p, q, h - 1 / 3);
+    }
+
+    return [
+        Math.round(r * 255),
+        Math.round(g * 255),
+        Math.round(b * 255),
+        a
+    ];
+}
+
+function toHex(value) {
+    value = value.toString(16);
+    return value.length === 1 ? '0' + value : value;
+}
+
+function parseFunctionArgs(functionArgs, count, rgb) {
+    var argument = functionArgs.head;
+    var args = [];
+
+    while (argument !== null) {
+        var argumentPart = argument.data.sequence.head;
+        var wasValue = false;
+
+        while (argumentPart !== null) {
+            var value = argumentPart.data;
+            var type = value.type;
+
+            switch (type) {
+                case 'Number':
+                case 'Percentage':
+                    if (wasValue) {
+                        return;
+                    }
+
+                    wasValue = true;
+                    args.push({
+                        type: type,
+                        value: Number(value.value)
+                    });
+                    break;
+
+                case 'Operator':
+                    if (wasValue || value.value !== '+') {
+                        return;
+                    }
+                    break;
+
+                default:
+                    // something we couldn't understand
+                    return;
+            }
+
+            argumentPart = argumentPart.next;
+        }
+
+        argument = argument.next;
+    }
+
+    if (args.length !== count) {
+        // invalid arguments count
+        // TODO: remove those tokens
+        return;
+    }
+
+    if (args.length === 4) {
+        if (args[3].type !== 'Number') {
+            // 4th argument should be a number
+            // TODO: remove those tokens
+            return;
+        }
+
+        args[3].type = 'Alpha';
+    }
+
+    if (rgb) {
+        if (args[0].type !== args[1].type || args[0].type !== args[2].type) {
+            // invalid color, numbers and percentage shouldn't be mixed
+            // TODO: remove those tokens
+            return;
+        }
+    } else {
+        if (args[0].type !== 'Number' ||
+            args[1].type !== 'Percentage' ||
+            args[2].type !== 'Percentage') {
+            // invalid color, for hsl values should be: number, percentage, percentage
+            // TODO: remove those tokens
+            return;
+        }
+
+        args[0].type = 'Angle';
+    }
+
+    return args.map(function(arg) {
+        var value = Math.max(0, arg.value);
+
+        switch (arg.type) {
+            case 'Number':
+                // fit value to [0..255] range
+                value = Math.min(value, 255);
+                break;
+
+            case 'Percentage':
+                // convert 0..100% to value in [0..255] range
+                value = Math.min(value, 100) / 100;
+
+                if (!rgb) {
+                    return value;
+                }
+
+                value = 255 * value;
+                break;
+
+            case 'Angle':
+                // fit value to (-360..360) range
+                return (((value % 360) + 360) % 360) / 360;
+
+            case 'Alpha':
+                // fit value to [0..1] range
+                return Math.min(value, 1);
+        }
+
+        return Math.round(value);
+    });
+}
+
+function compressFunction(node, item, list) {
+    var functionName = node.name;
+    var args;
+
+    if (functionName === 'rgba' || functionName === 'hsla') {
+        args = parseFunctionArgs(node.arguments, 4, functionName === 'rgba');
+
+        if (!args) {
+            // something went wrong
+            return;
+        }
+
+        if (functionName === 'hsla') {
+            args = hslToRgb.apply(null, args);
+            node.name = 'rgba';
+        }
+
+        if (args[3] !== 1) {
+            // replace argument values for normalized/interpolated
+            node.arguments.each(function(argument) {
+                var item = argument.sequence.head;
+
+                if (item.data.type === 'Operator') {
+                    item = item.next;
+                }
+
+                argument.sequence = new List([{
+                    type: 'Number',
+                    info: item.data.info,
+                    value: packNumber(args.shift())
+                }]);
+            });
+
+            return;
+        }
+
+        // otherwise convert to rgb, i.e. rgba(255, 0, 0, 1) -> rgb(255, 0, 0)
+        functionName = 'rgb';
+    }
+
+    if (functionName === 'hsl') {
+        args = args || parseFunctionArgs(node.arguments, 3, false);
+
+        if (!args) {
+            // something went wrong
+            return;
+        }
+
+        // convert to rgb
+        args = hslToRgb.apply(null, args);
+        functionName = 'rgb';
+    }
+
+    if (functionName === 'rgb') {
+        args = args || parseFunctionArgs(node.arguments, 3, true);
+
+        if (!args) {
+            // something went wrong
+            return;
+        }
+
+        // check if color is not at the end and not followed by space
+        var next = item.next;
+        if (next && next.data.type !== 'Space') {
+            list.insert(list.createItem({
+                type: 'Space'
+            }), next);
+        }
+
+        item.data = {
+            type: 'Hash',
+            info: node.info,
+            value: toHex(args[0]) + toHex(args[1]) + toHex(args[2])
+        };
+
+        compressHex(item.data, item);
+    }
+}
+
+function compressIdent(node, item) {
+    if (this.declaration === null) {
+        return;
+    }
+
+    var color = node.name.toLowerCase();
+
+    if (NAME_TO_HEX.hasOwnProperty(color)) {
+        var hex = NAME_TO_HEX[color];
+
+        if (hex.length + 1 <= color.length) {
+            // replace for shorter hex value
+            item.data = {
+                type: 'Hash',
+                info: node.info,
+                value: hex
+            };
+        } else {
+            // special case for consistent colors
+            if (color === 'grey') {
+                color = 'gray';
+            }
+
+            // just replace value for lower cased name
+            node.name = color;
+        }
+    }
+}
+
+function compressHex(node, item) {
+    var color = node.value.toLowerCase();
+
+    // #112233 -> #123
+    if (color.length === 6 &&
+        color[0] === color[1] &&
+        color[2] === color[3] &&
+        color[4] === color[5]) {
+        color = color[0] + color[2] + color[4];
+    }
+
+    if (HEX_TO_NAME[color]) {
+        item.data = {
+            type: 'Identifier',
+            info: node.info,
+            name: HEX_TO_NAME[color]
+        };
+    } else {
+        node.value = color;
+    }
+}
+
+module.exports = {
+    compressFunction: compressFunction,
+    compressIdent: compressIdent,
+    compressHex: compressHex
+};
diff --git a/node_modules/csso/lib/compressor/compress/index.js b/node_modules/csso/lib/compressor/compress/index.js
new file mode 100644
index 00000000..ff6b0296
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/index.js
@@ -0,0 +1,22 @@
+var walk = require('../../utils/walk.js').all;
+var handlers = {
+    Atrule: require('./Atrule.js'),
+    Attribute: require('./Attribute.js'),
+    Value: require('./Value.js'),
+    Dimension: require('./Dimension.js'),
+    Percentage: require('./Number.js'),
+    Number: require('./Number.js'),
+    String: require('./String.js'),
+    Url: require('./Url.js'),
+    Hash: require('./color.js').compressHex,
+    Identifier: require('./color.js').compressIdent,
+    Function: require('./color.js').compressFunction
+};
+
+module.exports = function(ast) {
+    walk(ast, function(node, item, list) {
+        if (handlers.hasOwnProperty(node.type)) {
+            handlers[node.type].call(this, node, item, list);
+        }
+    });
+};
diff --git a/node_modules/csso/lib/compressor/compress/property/background.js b/node_modules/csso/lib/compressor/compress/property/background.js
new file mode 100644
index 00000000..210127a9
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/property/background.js
@@ -0,0 +1,66 @@
+var List = require('../../../utils/list.js');
+
+module.exports = function compressBackground(node) {
+    function lastType() {
+        if (buffer.length) {
+            return buffer[buffer.length - 1].type;
+        }
+    }
+
+    function flush() {
+        if (lastType() === 'Space') {
+            buffer.pop();
+        }
+
+        if (!buffer.length) {
+            buffer.unshift(
+                {
+                    type: 'Number',
+                    value: '0'
+                },
+                {
+                    type: 'Space'
+                },
+                {
+                    type: 'Number',
+                    value: '0'
+                }
+            );
+        }
+
+        newValue.push.apply(newValue, buffer);
+
+        buffer = [];
+    }
+
+    var newValue = [];
+    var buffer = [];
+
+    node.sequence.each(function(node) {
+        if (node.type === 'Operator' && node.value === ',') {
+            flush();
+            newValue.push(node);
+            return;
+        }
+
+        // remove defaults
+        if (node.type === 'Identifier') {
+            if (node.name === 'transparent' ||
+                node.name === 'none' ||
+                node.name === 'repeat' ||
+                node.name === 'scroll') {
+                return;
+            }
+        }
+
+        // don't add redundant spaces
+        if (node.type === 'Space' && (!buffer.length || lastType() === 'Space')) {
+            return;
+        }
+
+        buffer.push(node);
+    });
+
+    flush();
+    node.sequence = new List(newValue);
+};
diff --git a/node_modules/csso/lib/compressor/compress/property/font-weight.js b/node_modules/csso/lib/compressor/compress/property/font-weight.js
new file mode 100644
index 00000000..29122eb6
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/property/font-weight.js
@@ -0,0 +1,22 @@
+module.exports = function compressFontWeight(node) {
+    var value = node.sequence.head.data;
+
+    if (value.type === 'Identifier') {
+        switch (value.name) {
+            case 'normal':
+                node.sequence.head.data = {
+                    type: 'Number',
+                    info: value.info,
+                    value: '400'
+                };
+                break;
+            case 'bold':
+                node.sequence.head.data = {
+                    type: 'Number',
+                    info: value.info,
+                    value: '700'
+                };
+                break;
+        }
+    }
+};
diff --git a/node_modules/csso/lib/compressor/compress/property/font.js b/node_modules/csso/lib/compressor/compress/property/font.js
new file mode 100644
index 00000000..783685f4
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/property/font.js
@@ -0,0 +1,45 @@
+module.exports = function compressFont(node) {
+    var list = node.sequence;
+
+    list.eachRight(function(node, item) {
+        if (node.type === 'Identifier') {
+            if (node.name === 'bold') {
+                item.data = {
+                    type: 'Number',
+                    info: node.info,
+                    value: '700'
+                };
+            } else if (node.name === 'normal') {
+                var prev = item.prev;
+
+                if (prev && prev.data.type === 'Operator' && prev.data.value === '/') {
+                    this.remove(prev);
+                }
+
+                this.remove(item);
+            } else if (node.name === 'medium') {
+                var next = item.next;
+
+                if (!next || next.data.type !== 'Operator') {
+                    this.remove(item);
+                }
+            }
+        }
+    });
+
+    // remove redundant spaces
+    list.each(function(node, item) {
+        if (node.type === 'Space') {
+            if (!item.prev || !item.next || item.next.data.type === 'Space') {
+                this.remove(item);
+            }
+        }
+    });
+
+    if (list.isEmpty()) {
+        list.insert(list.createItem({
+            type: 'Identifier',
+            name: 'normal'
+        }));
+    }
+};