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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              .main-container.fixed-width
	.row
		%h1.span-12
			12 Column Calc() Responsive Grid
			%small (Incomplete)
	.row
		%p.span-8
			This is a responsive grid that uses 
			%code calc()
			(CSS3 Function) to set the widths of the sections for supporting browsers. 
			%a{:href => "http://caniuse.com/#feat=calc", :title => "Can I Use Calc() as CSS unit value"} Non-supporting browsers 
			(Opera, Android Browser, <abbr title="Internet Explorer 8">IE8</abbr> on down) will get a fallback stylesheet (Opera and Android Browser through a Modernizr test or a conditional CSS class "<code>no-csscalc</code>", <abbr title="Internet Explorer 8">IE8</abbr> on down through 
			%a{:href => "https://css-tricks.com/how-to-create-an-ie-only-stylesheet/", :title => "How To Create an IE-Only Stylesheet"} Conditional Comments
			) with percentage widths (and <code>DHTML</code> expression widths for <abbr title="Internet Explorer 7">IE7</abbr>).
.main-container
	.row
		.span-12
			.width-unit
	.row
		.span-1
			.width-unit
		.span-11
			.width-unit
	.row
		.span-2
			.width-unit
		.span-10
			.width-unit
	.row
		.span-3
			.width-unit
		.span-9
			.width-unit
	.row
		.span-4
			.width-unit
		.span-8
			.width-unit
	.row
		.span-5
			.width-unit
		.span-7
			.width-unit
	.row
		.span-6
			.width-unit
		.span-6
			.width-unit
	.row
		.span-1.suffix-11
			.width-unit
	.row
		.span-1.prefix-1.suffix-10
			.width-unit
	.row
		.span-1.prefix-2.suffix-9
			.width-unit
	.row
		.span-1.prefix-3.suffix-8
			.width-unit
	.row
		.span-1.prefix-4.suffix-7
			.width-unit
	.row
		.span-1.prefix-5.suffix-6
			.width-unit
	.row
		.span-1.prefix-6.suffix-5
			.width-unit
	.row
		.span-1.prefix-7.suffix-4
			.width-unit
	.row
		.span-1.prefix-8.suffix-3
			.width-unit
	.row
		.span-1.prefix-9.suffix-2
			.width-unit
	.row
		.span-1.prefix-10.suffix-1
			.width-unit
	.row
		.span-1.prefix-11
			.width-unit
	.row
		.span-6
			.row
				.span-6
					.width-unit
				.span-6
					.width-unit
		.span-6
			.row
				.span-4
					.width-unit
				.span-4
					.width-unit
				.span-4
					.width-unit
	.underlay
		.row
			- (1..12).each do
				.span-1
					%div
            
          
!

CSS

            
              @import "compass/css3";

/* SCSS Variables */
$siteWidth: 960px;
$gutterWidth: 20px;
$halfGutterWidth: ($gutterWidth/2);

/* Core Grid */
.main-container {
    margin: 0 auto;
    width: $siteWidth;
}
.row {
    clear: both;
    margin-left: -$halfGutterWidth; /* In this case 10px */
    width: $siteWidth;
    .row {
        margin-left: -$gutterWidth; /* In this case 20px */
        width: auto;
    }
    &:before,
    &:after {
        content: "";
        display: table;
    }
    &:after {
        clear: both;
    }
}
[class*="span-"] { /* I included prefixed versions on box sizing because Prefixer takes a second to load and didn't feel like putting the JS script for the width detection in a document load function */
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
    float: left;
    margin: 0;
    padding-left: $gutterWidth; /* In this case 20px */
}
.span-1  { width: calc(100% / 12); }
.span-2  { width: calc(100% / 12 *  2); }
.span-3  { width: calc(100% / 12 *  3); }
.span-4  { width: calc(100% / 12 *  4); }
.span-5  { width: calc(100% / 12 *  5); }
.span-6  { width: calc(100% / 12 *  6); }
.span-7  { width: calc(100% / 12 *  7); }
.span-8  { width: calc(100% / 12 *  8); }
.span-9  { width: calc(100% / 12 *  9); }
.span-10 { width: calc(100% / 12 * 10); }
.span-11 { width: calc(100% / 12 * 11); }
.span-12 { width: calc(100%); }

.suffix-1  { margin-right: calc(100% / 12 *  1); }
.suffix-2  { margin-right: calc(100% / 12 *  2); }
.suffix-3  { margin-right: calc(100% / 12 *  3); }
.suffix-4  { margin-right: calc(100% / 12 *  4); }
.suffix-5  { margin-right: calc(100% / 12 *  5); }
.suffix-6  { margin-right: calc(100% / 12 *  6); }
.suffix-7  { margin-right: calc(100% / 12 *  7); }
.suffix-8  { margin-right: calc(100% / 12 *  8); }
.suffix-9  { margin-right: calc(100% / 12 *  9); }
.suffix-10 { margin-right: calc(100% / 12 * 10); }
.suffix-11 { margin-right: calc(100% / 12 * 11); }

.prefix-1  { margin-left: calc(100% / 12 *  1); }
.prefix-2  { margin-left: calc(100% / 12 *  2); }
.prefix-3  { margin-left: calc(100% / 12 *  3); }
.prefix-4  { margin-left: calc(100% / 12 *  4); }
.prefix-5  { margin-left: calc(100% / 12 *  5); }
.prefix-6  { margin-left: calc(100% / 12 *  6); }
.prefix-7  { margin-left: calc(100% / 12 *  7); }
.prefix-8  { margin-left: calc(100% / 12 *  8); }
.prefix-9  { margin-left: calc(100% / 12 *  9); }
.prefix-10 { margin-left: calc(100% / 12 * 10); }
.prefix-11 { margin-left: calc(100% / 12 * 11); }

[class*="push_"],
[class*="pull_"] {
  position: relative;
}
.push-1  { left: calc(100% / 12 *  1); }
.push-2  { left: calc(100% / 12 *  2); }
.push-3  { left: calc(100% / 12 *  3); }
.push-4  { left: calc(100% / 12 *  4); }
.push-5  { left: calc(100% / 12 *  5); }
.push-6  { left: calc(100% / 12 *  6); }
.push-7  { left: calc(100% / 12 *  7); }
.push-8  { left: calc(100% / 12 *  8); }
.push-9  { left: calc(100% / 12 *  9); }
.push-10 { left: calc(100% / 12 * 10); }
.push-11 { left: calc(100% / 12 * 11); }

.pull-1  { left: calc(100% / 12 *  1 * -1); }
.pull-2  { left: calc(100% / 12 *  2 * -1); }
.pull-3  { left: calc(100% / 12 *  3 * -1); }
.pull-4  { left: calc(100% / 12 *  4 * -1); }
.pull-5  { left: calc(100% / 12 *  5 * -1); }
.pull-6  { left: calc(100% / 12 *  6 * -1); }
.pull-7  { left: calc(100% / 12 *  7 * -1); }
.pull-8  { left: calc(100% / 12 *  8 * -1); }
.pull-9  { left: calc(100% / 12 *  9 * -1); }
.pull-10 { left: calc(100% / 12 * 10 * -1); }
.pull-11 { left: calc(100% / 12 * 11 * -1); }


/* Visual Styling */
.main-container {
    box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.4);
    position: relative;
}
.row {
    margin-bottom: 16px;
    margin-top: 16px;
    .row {
        background-color: transparent;
        margin-bottom: 0;
        margin-top: 0;
    }
}
[class*="span-"] .width-unit {
    background-color: rgba(255, 255, 255, 0.7);
    height: 40px;
    line-height: 40px;
    text-align: center;
}

/* Responsive Underlay Styling */
.underlay {
    background-color: green;
    left: 0;
    min-height: 100%;
    position: absolute;
    top: 0;
    width: calc(#{$siteWidth});
    z-index: -1;
    .row {
        margin-bottom: 0;
        margin-top: 0;
    }
}
.underlay [class*="span-"] div {
    background-color: rgba(0, 0, 0, 0.2);
}


/* This for the description at top */
.main-container.fixed-width {
    box-shadow: none;
    width: 980px;
}
            
          
!

JS

            
              /* Modernizr 2.6.2 (Custom Build) | MIT & BSD
 * Build: https://modernizr.com/download/#-fontface-backgroundsize-borderimage-borderradius-boxshadow-flexbox-flexboxlegacy-hsla-multiplebgs-opacity-rgba-textshadow-cssanimations-csscolumns-generatedcontent-cssgradients-cssreflections-csstransforms-csstransforms3d-csstransitions-applicationcache-canvas-canvastext-draganddrop-hashchange-history-audio-video-indexeddb-input-inputtypes-localstorage-postmessage-sessionstorage-websockets-websqldatabase-webworkers-geolocation-inlinesvg-smil-svg-svgclippaths-touch-webgl-shiv-cssclasses-teststyles-testprop-testallprops-hasevent-prefixes-domprefixes-css_calc-load
 */
;window.Modernizr=function(a,b,c){function C(a){j.cssText=a}function D(a,b){return C(n.join(a+";")+(b||""))}function E(a,b){return typeof a===b}function F(a,b){return!!~(""+a).indexOf(b)}function G(a,b){for(var d in a){var e=a[d];if(!F(e,"-")&&j[e]!==c)return b=="pfx"?e:!0}return!1}function H(a,b,d){for(var e in a){var f=b[a[e]];if(f!==c)return d===!1?a[e]:E(f,"function")?f.bind(d||b):f}return!1}function I(a,b,c){var d=a.charAt(0).toUpperCase()+a.slice(1),e=(a+" "+p.join(d+" ")+d).split(" ");return E(b,"string")||E(b,"undefined")?G(e,b):(e=(a+" "+q.join(d+" ")+d).split(" "),H(e,b,c))}function J(){e.input=function(c){for(var d=0,e=c.length;d<e;d++)u[c[d]]=c[d]in k;return u.list&&(u.list=!!b.createElement("datalist")&&!!a.HTMLDataListElement),u}("autocomplete autofocus list placeholder max min multiple pattern required step".split(" ")),e.inputtypes=function(a){for(var 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if (!Modernizr.csscalc){
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}
            
          
!
999px

Console