#topnav {
    border-bottom: 1px solid #ddd;
}

#sidebar {
    background-color: #EEE;
    position: absolute;
    top: 35px;
    bottom: 0;
    left: 0;
    width: 200px;
    overflow: auto;
}
#content {
    position: absolute;
    top: 32px;
    bottom: 0;
    left: 0px;
    right: 0;
    overflow: hidden;
    color: #FFF;

}
#top-content {
    position: absolute;
    top: 0;
    bottom: 136px; /* 130 + 6 */
    left: 0;
    right: 0px;
    background-color: #f2f1f0;
    overflow: auto;

}
#bottom-content {
    position: absolute;
    height: 130px;
    bottom: 0;
    left: 0;
    right: 0;
    overflow: auto;
    background-color: #f2f1f0;
}

#sidebar-resizer {
    background-color: #f2f1f0;
    position: absolute;
    top: 35px;
    bottom: 0;
    left: 200px;
    width: 6px;
    cursor: e-resize;
}
#content-resizer {
    position: absolute;
    height: 2px;
    bottom: 130px;
    left: 0;
    right: 0;
    background-color: #f2f1f0;
    cursor: n-resize;

}

#sidebar-resizer:hover, #preview-resizer:hover {
    background-color: #f2f1f0;
}