CSS - Borders won't line up

Having an issue I'm not sure can be fixed. Hoping someone here can help me.

When I style the outter DIV's with:
border-left: 1px solid #000;

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the lines on the left don't line up:

left-borders-not-lined-up
I'll try different pixel sizes and stuff but it doesn't seem to fix it.
Something I should change?


HTML Code:
<html>
<head>
	<title>Website</title>
	<link rel="stylesheet" href="style.css" type="text/css" />
</head>
<body>

<div id="container">
	<div id="header">
		<h1>Website</h1>
	</div>
	<div id="navigation">
		<ul>
			<li><a href="index.html">Home</a></li>
			<li><a href="#">Residential</a></li>
			<li><a href="#">Business</a></li>
			<li><a href="#">Training & Consulting</a></li>
			<li><a href="#">Store</a></li>
		</ul>
	</div>
	<div id="content-container">
		<div id="content">
			<h2>
				Welcome to computer support. How can I help you?
			</h2>
			
			<p>
			<a class="helpwizard" href="#">
			<u>I am residential customer in need of computer help</u><i></i>
			</a>
			</p>
			
			<p>
			<a class="helpwizard" href="#">
			<u>I need IT services for my business</u><i></i>
			</a>
			</p>
			
			<p>
			<a class="helpwizard" href="dellhw/dellhw.html">
			<u>I want to buy a new computer</u><i></i>
			</a>
			</p>

			</div>
		<div id="aside">
			<h3>
				Top Articles & Videos
			</h3>
			<p>
			<a href="#">article 1 </a> <br>
			<a href="#">article 2 </a> <br>
			<a href="#">article 3</a> <br>
			<a href="#">article 4 </a> <br> 
				
			</p>


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


</body>
</html>

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CSS Style Code:
body {
/* Note: This gradient may render differently in browsers that don't support the unprefixed gradient syntax */
/* IE10 Consumer Preview */ 
background-image: -ms-linear-gradient(top left, #3d3d3d 0%, #00adee 100%);
/* Mozilla Firefox */ 
background-image: -moz-linear-gradient(top left, #3d3d3d 0%, #00adee 100%);
/* Opera */ 
background-image: -o-linear-gradient(top left, #3d3d3d 0%, #00adee 100%);
/* Webkit (Safari/Chrome 10) */ 
background-image: -webkit-gradient(linear, left top, right bottom, color-stop(0, #3d3d3d), color-stop(1, #00adee));
/* Webkit (Chrome 11+) */ 
background-image: -webkit-linear-gradient(top left, #3d3d3d 0%, #00adee 100%);
/* W3C Markup, IE10 Release Preview */ 
background-image: linear-gradient(to bottom right, #3d3d3d 0%, #00adee 100%);
}

#container
{
	margin: 0 auto;
	margin-top:20px;
	width: 900px;
    background: #fff;
		border-left: 1px solid #000;
border-right: 1px solid #000;
}

#header
{
height: 100px;

	padding: 20px;
}

#header h1 {
margin: 0;
color: #7b9d3c;
background: url(logo.png) top left no-repeat;
width: 470px;
height: 419px;
text-indent: -9999px;

}

#navigation
{
	float: left;
	width: 900px;
	background: #cccccc;
	border-left: 1px solid #000;
	border-right: 1px solid #000;
}

#navigation ul
{
	margin: 0;
	padding: 0;
	
}

#navigation ul li
{
	list-style-type: none;
	display: inline;
}

#navigation li a
{
	display: block;
	float: left;
	padding: 5px 10px;
	color: #000;
	text-decoration: none;
	border-right: 1px solid #fff;
}

#navigation li a:hover {
background: #000; 
color: #6fd8ff;


}

#content-container
{
	float: left;
	width: 900px;
	background: #fff url(/wp-content/uploads/layout-two-fixed-background.gif) repeat-y 100% 0;
	font-family:helvetica,arial,sans-serif;
	border-left: 1px solid #000;
	border-right: 1px solid #000;
}

#content
{
	clear: left;
	float: left;
	width: 560px;
	padding: 20px 0;
	margin: 0 0 0 30px;
	display: inline;
	
}

#content h2 {
margin: 0;
color: #00adee;
}

#aside
{
	float: right;
	width: 240px;
	padding: 20px 0;
	margin: 0 20px 0 0;
	display: inline;
}

#aside a
{
	display: block;

	padding: 5px 10px;
	color: #000;
	text-decoration: none;
	border-right: 1px solid #fff;
}

#aside a:hover {
background: #e1f7ff; 


}

#aside h3 { margin: 0; }

a.helpwizard:link {
color:#000;
display: block;
background-color: #e1f7ff;
text-decoration: none;
text-decoration: strong;
}

a.helpwizard:hover {
background-color: #00adee;
text-decoration: none;
text-decoration: strong;
color: #000;
}

a.helpwizard:visited {
color:#000;
display: block;
text-decoration: none;
text-decoration: strong;
}

#footer
{
	clear: both;
	background: #ccc;
	text-align: right;
	padding: 20px;
	height: 1%;
	
}

a.button {
   display:inline-block;
   width: 122;
   height: 102px; 
   background-position: left top;
   background-repeat: no-repeat;
   margin: 5px;
   color: #000;
   text-align: left;
}

a.button:hover {

background: rgba(158, 180, 82, .5);
}

a.button#battery { background-image: url('dellhw/images/dell-battery.png'); }
a.button#extmonitor { background-image: url('dellhw/images/dell-external-monitor.png'); }

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garryshapeAsked:
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GaryConnect With a Mentor Commented:
Add overflow:auto to your container and remove the left and right border from the other div's
0
 
garryshapeAuthor Commented:
Cool thanks, I'm trying it out

Only thing is it adds scrollbars to the container after that

Should I increase the with of each div?
0
 
GaryCommented:
Change the widths on the inner div's to 100% and not 900px
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garryshapeAuthor Commented:
Sorry I'm dumb, I put overflow: scroll; insetad of auto.

Looks great! TY
0
 
GaryCommented:
That makes sense as I wasn't seeing any scrolling.
0
 
garryshapeAuthor Commented:
Thx So Much
It Worked
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