html, body {
    margin: 0;
    padding: 0;

    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

canvas#viewport {
    display: block;
    width: 800px;
    margin: 0;
}