div with dynamic min-height based on browser window height

html,
body {
  margin: 0;
  padding: 0;
  height: 100%; /* needed for container min-height */
}
div#container {
  position: relative; /* needed for footer positioning*/
  height: auto !important; /* real browsers */
  min-height: 100%; /* real browsers */
}
div#header {
  padding: 1em;
  background: #efe;
}
div#content {
  /* padding:1em 1em 5em; *//* bottom padding for footer */
}
div#footer {
  position: absolute;
  width: 100%;
  bottom: 0; /* stick to bottom */
  background: #ddd;
}

<div id="container">

  <div id="header">header</div>

  <div id="content">
    content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>content<br/>
  </div>

  <div id="footer">
    footer
  </div>
</div>