CSS two column layout with border around the entire content area

I'm messing around with a typical fixed width two column layout and i'm trying to get a border around the entire content area. There is content in the left_column that goes below the border. What am i doing wrong?
<style type="text/css">
body {
	background-color:#9EBBEB;
	background-image:url(Gradient%20Background.jpg);
	background-position:top left;
	background-repeat:repeat-x;
	margin-left:auto;
	margin-right:auto;
	margin-top:0;
	padding-top:0;
}
#header {
	margin:0;
	padding-bottom:200px;
}
#shadow {
	background-image:url(DropShadowGradient.png);
	background-position:top center;
	background-repeat:repeat-y;
	margin:0;
	padding:0;
}
#container {
	margin-left:auto;
	margin-right:auto;
	width:780px;
	background:url(Header.jpg) top no-repeat;
	background-color:#444444;
	
}
 
 
 
#tabArea {
	list-style:none;
	text-align:left;
	padding:0;
	margin:0;
	
}
li.navLink a {
	
	color:#FFFCE8;
	text-decoration:none;
	font-weight:bold;
	font-family:"Copperplate Gothic Light";
	font-variant:small-caps;
	font-size:14px;
	padding:0 0 0 7px;
	margin:0;
}
 
 
li.navLink a:hover {
	
	
}
li.navLink {
	display:inline;
	padding:0;
	margin:0;
}
img.links {
}
#content_2 {
	display:none;
}
div.content {
	padding:0 10px 10px 10px;
	background-color:#FFFFFF;
	border:solid #353535;
	margin:0;
	padding:10px;
 
}
div.right_column {
	
	margin-left:520px;
	background-color:#00CC66;
}
div.left_column {
	float:left;
	width:500px;
}
 
 
 
 
</style>
</head>
<body>
<div id="shadow">
	<div id="container">
    	<div id="header">
        
        </div>
    	<div id="nav">
        	<ul id="tabArea">
            	<li class="navLink" id="first"><a href="#" title="content_1" class="tab">Home</a></li>
                <li class="navLink"><a href="#" title="content_2" class="tab">Portfolio</a></li>
            </ul>        
        </div>  
        <div id="content_1" class="content">
        	<div id="left_column_1" class="left_column">
        		<h1>Creative Solutions <small>Idea's that Make Money</small></h1>
            	<p>Specializing in highly interactive website design and development, let us help you create something that will be provide information and attract customers.</p>
            	<ul id="services">
            		<h2>Services we offer</h2>
            	    <li>Website Design</li>
            	    <li>E-Commerce</li>
            	    <li>Content Management</li>
            	    <li>Custom Programming</li>
            	    <li>Logo design</li>
            	</ul>
         	</div> 
        	<div id="right_column_1" class="right_column">
            	<h3>This is the right column</h3>
                <p>ejwio we jwe ojew oijw jew howe owe jewh ewhojew ;jwej ewho ew hoew oiew ewjew ewj</p>
        	</div>
   		</div>
        
        
        
        
        <div id="content_2" class="content">
        	
           		<h1>Page 2</h1>
            	<p>This is fucking Gay</p>
            	<h1>Wazzuppppp</h1>
                
      	</div>
    </div>
</div>
</body>
</html>

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LVL 2
toymachiner62Asked:
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khsaterCommented:
Adding overflow: hidden to div.content fixes it.
I'm no expert, so I have no clue why.
0

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toymachiner62Author Commented:
Can anyone explain to me why this is?
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