styles.css

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

#title {
    text-align: center;
}

#button-wrap {
    text-align: center;
    top: 55%;
    position: relative;
}

#content-wrapper {
    padding: 0;
    margin: 0;
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
}

#container {
    top: 80px;
    height: 50%;
    left: 50%;
    margin-left: -225px;
    width: 450px;
    overflow: hidden;
    position: absolute;
    border: 1px solid #000;
    padding: 10px;
    padding-bottom: 20px;
}

#container.two-up {
    margin-left: -450px;
    width: 900px;
}

#content {
    height: 100%;
    overflow: visible;
    position: relative;
    padding: 0;
    -webkit-column-width: 440px;
    -webkit-column-gap: 10px;
    -webkit-transition-property: opacity;  
    -webkit-transition-duration: 0.1s;  
    -webkit-transition-timing-function: ease;  
    -moz-column-width: 440px;
    -moz-column-gap: 10px;
    -moz-transition-property: opacity;  
    -moz-transition-duration: 0.1s;  
    -moz-transition-timing-function: ease;  
    
}​