JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<div class="row no-space">
    <div class="span3 blue1">
        <h1>span4 (1)</h1>
    </div>
    <div class="span3 blue2">
        <h1>span4 (2)</h1>
   </div>
    <div class="span3 blue3">
        <h1>span4 (3)</h1>
    </div>
</div>

CSS

.blue1 {
    background-color:#66AEF3;
}

.blue2 {
    background-color:#3795ef;
}

.blue3 {
    background-color:#0e62b2;
}

.no-space [class*="span"] {
    margin-left: 0;
}

.no-space {
    margin-left:0;
}