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A Pen By Captain Anonymous

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              <div id="container" class="cf">
  <div id="sidebar">
    <p>This is the sidebar.</p>
    <p> Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin eu velit quis metus imperdiet euismod. Nam varius iaculis odio at auctor.</p>
  <div id="content">
    <h1>Main Content</h1>
    <p>This is the flexible main content area.</p>
body {
#container {
  background: #b00b00;
  border-left: 300px solid #bada55;

#sidebar {
  float: left;
  width: 280px;
  padding: 10px;
  margin-left: -300px;

#content {
  padding: 10px;

.cf:after {
    content: " ";
    display: table;

.cf:after {
    clear: both;
.cf {
    *zoom: 1;
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