html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body .main {
    height: 100%;
    position: relative;
}

.main #c {
    width: 100%;
    height: 100%;
}

.main #offscreen {
    position: absolute;
    top: -999px;
    left: -999px;
    width: 128px;
    height: 128px;
    z-index: 1;
}

.main .sidepanel {
    position: absolute;
    height: 100%;
    width: 300px;
    left: 0;
    top: 0;
    background: white;
}