JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" type="text/css" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<body>
<div class="navbar navbar-fixed-top">
      <div class="navbar-inner">
        <div class="container">
          <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </a>
          <a class="brand" href="#">Project name</a>
          <div class="nav-collapse">
            <ul class="nav">
              <li class="active"><a href="#">Home</a></li>
              <li><a href="#about">About</a></li>
              <li><a href="#contact">Contact</a></li>
            </ul>
          </div><!--/.nav-collapse -->
        </div>
      </div>
    </div>

  <div class="container fill">
    <div id="map">
        1<br/>
        2<br/>
        3<br/>
      </div> <!-- This one wants to be 100% height -->
  </div>
</body>

CSS

#map {
        width: 100%;
        height: 100%;
        min-height: 100%;
        background: red;
        display: block;
    }
    
    html, body {
        height: 100%;
    }
    
    .fill { 
        min-height: 100%;
        height: 100%;
    }

body {
    padding-top:40px;
}