I\'m trying set up a layout that will look like this:

I want to use twitter bo
I managed to get the layout you mocked up in your post by first creating a main container class that is stretched 100% both vertically and horizontally, this way we can fully stretch the content within to the full height of your viewport. Within this container div i created another container and positioned it absolutely while stretching it in all directions, top, left, bottom, right, i felt that this method was cleaner cause this way i can easily position the header and footer without the need for negative margins (tried it like that but it didn't work).
Here is a demo of the layout: http://jsfiddle.net/andresilich/gbzTN/1/show, edit here.
And the code:
CSS
html, body {
height: 100%;
}
.main {
*zoom:1;
}
.main, .row-fluid {
height: 100%;
}
.main:before, .main:after,
.column:before, .column:after {
content: "";
display: table;
}
.main:after,
.column:after {
clear: both;
}
.column {
height: 100%;
overflow: auto;
*zoom:1;
}
.column .padding {
padding: 20px;
}
.box {
bottom: 40px;
left: 0;
position: absolute;
right: 0;
top: 40px;
}
.span9.full {
width: 100%;
}
.footer {
height: 40px;
width: 100%;
z-index: 100;
background-color: red;
bottom: 0;
left:0;
right:0;
position: fixed;
}
HTML
.. content ..
.. content ..
Edit: noticed that this solution does not work as expected in IE7 (works perfect in IE8 and above) so here is a conditional comment targeting everything below IE8 that should fix the issue and make it work as expected:
CSS