Equal, Full Height Colums using CSS Only

alphablossom-equal-height-fixed-width.css

.content-sidebar-wrap {
    position: relative;
    float: left;
    width: 100%;
    margin-bottom: 50px;
    z-index: 99; /* needed for Safari 7 */
}

.content:after,
.sidebar-primary:after {
    content: " ";
    background: none repeat scroll 0 0 #eee;
    border: 1px solid #CCCCCC;
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    z-index: -1;
}

.content:after {
    left: 0;
    width: 740px;
}

.sidebar-primary:after {
    right: 0;
    width: 360px;
}

alphablossom-equal-height-fluid-width.css

/**********************************
*
* Full Height Two Columns for Genesis Framework
* Sidebar / Content / Sidebar layout - Demo 3
*
* @author AlphaBlossom / Tony Eppright
* @link http://www.alphablossom.com
*
**********************************/

.site-inner {
    padding: 0;
    position: relative;
    z-index: 99; /* needed for Safari 7 */
}

.content-sidebar-wrap {
    position: relative;
    width: 80.7017543%; /* 920/1140 */
}


/* Change Secondary Sidebar, Content and Sidebar to percentage/fluid width */
.sidebar.sidebar-secondary {
    width: 19.2982456%; /* 220/1140 */
}

.content {
    width: 60.8695652%; /* 560/920 */
}

.sidebar.sidebar-primary {
    width: 39.1304347%; /* 360/920 */
}

.sidebar.sidebar-secondary:after,
.content:after,
.sidebar.sidebar-primary:after {
    content: " ";
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    z-index: -1;
}

.sidebar.sidebar-secondary:after {
    background: none repeat scroll 0 0 #CCCCCC;
    left: 0;
    width: 19.2982456%; /* 220/1140 */
}

.content:after {
    background: none repeat scroll 0 0 #0099ff;
    left: 0;
    width: 60.8695652%; /* 560/920 */
}

.sidebar.sidebar-primary:after {
    background: none repeat scroll 0 0 #ff9900;
    right: 0;
    width: 39.1304347%; /* 360/920 */
}

one-true-layout.css

/**********************************
*
* Full Height Two Columns for Genesis Framework
* Content / Sidebar layout - Demo 1
*
* @author AlphaBlossom / Tony Eppright
* @link http://www.alphablossom.com
*
**********************************/

.content-sidebar-wrap {
    overflow: hidden;
}

main.content,
.sidebar-primary {
    background-color: #ccc;
    padding-bottom: 20000px;
    margin-bottom: -20000px;
    border: 1px solid #000;
}