Div height 100% formatting Issue - css

Question

I am trying to make the sidebar fill the height between the header and foot. As you can see it is going behind the footer. I would like it to stop at the top of the footer. Any help would be great!
Demo at: http://www.jsfiddle.net/pEbhK/
The HTML:
<div class="header">
<h2>Development Area</h2>
</div>
<div class="sidebar">
<h2>Current Projects</h2>
<ul>
<li>iCalendar</li>
<li>MyBand - Student Center</li>
</ul>
<h2>Future Projects</h2>
<ul>
<li>Mobile Application</li>
<li>RSS Feed</li>
</ul>
</div>
<div class="clear"></div>
<div class="footer">© 2013</div>
The CSS:
html, body, h1, h2 {
margin:0px;
padding:0px;
}
.clear {
clear:both;
}
.header {
display:inline-block;
width:100%;
background:#ABBFF2;
height:100px;
border-bottom: 5px solid #7F9DEB;
text-align:center;
}
.header h2 {
padding-top:38px;
}
.sidebar {
position: fixed;
height:100%;
width:250px;
background:#ABBFF2;
border-right:5px solid #7F9DEB;
float:left;
}
.sidebar h2 {
text-align:center;
}
.footer {
position:fixed;
display:inline-block;
bottom:0px;
width:100%;
height:30px;
border-top:5px solid #7f9deb;
text-align:center;
}

Answer 1

Try height:calc(100% - 140px) in .sidebar
.sidebar {
position: fixed;
height:calc(100% - 140px);
width:250px;
background:#ABBFF2;
border-right:5px solid #7F9DEB;
float:left;
}
updated jsFiddle File

Answer 2

A non-calc() way of doing this...
Your sidebar and footed have position: fixed, so they are positioned with respect to the view port.
You can size the sidebar using the following CSS:
.sidebar {
position: fixed;
top: 105px;
bottom: 35px;
left: 0px;
width:250px;
background:#ABBFF2;
border-right:5px solid #7F9DEB;
}
The value for the top offset is the header height + 5px for the border. Likewise, the bottom offset is the footer height + 5px for its border.
See demo at: http://jsfiddle.net/audetwebdesign/Lfpxq/
Note: You may want to add a min-height to the sidebar to prevent the content overflow issues. I think the same issue arises when using the calc() method.

Answer 3

Or write this to .footer in the css
background-color: #fff;