html,
body {
    background-color: white;
    overflow: hidden;
}

app {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

.noselect {
    user-select: none;
}

*:fullscreen,
*:-moz-full-screen,
*:-ms-fullscreen {
    background: white;
}

.watermark {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    border-style: solid;
    border-width: 15px;
    border-color: red;
}