You could use float:left
on the first two middle columns and a float:right
on the third. I would put an overflow:hidden
on the wrapper for the middle columns.
.mid-section
{
background-color: blue;
width: 100%;
height:1000px;
overflow:hidden;
}
.left-wrapper, .right-wrapper {
background: #ffff00;
height: 100%;
min-height: 100%;
width: 21%;
display:block;
float:left;
margin:0;
}
.right-wrapper {
background:#efefef;
float:right;
}
.main-content {
background-color: black;
width: 58%;
height: 100%;
margin:0;
float:left;
}