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

.page {
    width: 100%;
    height: 100%;
}

#camera > video, #camera > canvas {
    position: absolute;
    top: 0;
    left: 0;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    left: 0;
    right: 0;
}

#camera > video {
    z-index: 0;
}
#camera > canvas {
    z-index: 1;
}