Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
  <link rel='stylesheet' type='text/css' href='styles.css'>
  <style id="jsbin-css">
body {
  z-index:0;
  background-color: black;
}
#header {
  z-index: 7;
  position: fixed;
  height: 80px;
  width: 102%;
  margin: auto;
  margin-top: -10px;
  margin-left:-2%;
  background-color: red;
  }
#main_container{
  z-index: 1;
  /*position: relative;*/
  width:800px;
  height: 1620px;
  margin: 0 auto;
  background-color: #A3A6A7;
  }
</style>
</head>
  <div id='header'>
	</div>
	<div id='main_container'>
		<div id='jumbotron'>
		</div>
		<div class='materials'>
		</div>
		<div class='materials'>
		</div>
	</div>
	<div id='footer'></div>

<script id="jsbin-source-css" type="text/css">body {
  z-index:0;
  background-color: black;
}
#header {
  z-index: 7;
  position: fixed;
  height: 80px;
  width: 102%;
  margin: auto;
  margin-top: -10px;
  margin-left:-2%;
  background-color: red;
  }
#main_container{
  z-index: 1;
  /*position: relative;*/
  width:800px;
  height: 1620px;
  margin: 0 auto;
  background-color: #A3A6A7;
  }
</script>