canvas {
    position: fixed;
    top: 0;
    left: 0;
}

body {
    overflow-x: hidden;
    overflow-y: scroll;
    padding: 0;
    margin: 0;
}
#viewport {
    position: fixed;
    margin: 0;
    padding: 0;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
}
.page-wrapper {
    padding: 0px;
    margin: 12px 48px;
    position: absolute;
    left: 0;
    top: 0;
    width: calc(100% - 2*48px);
    word-wrap: break-word;
}