#canvas {
    height:calc(100dvh - 60px);
    text-align: left;
    width:100%;
    background: #eef;
    -moz-user-select: none;
    -khtml-user-select: none;
    -webkit-user-select: none;
    user-select: none;
}
#help {
    padding:10px;
    width: 300px;
}
#help.shown {
    height: 280px !important;
}
body {
    width:95%;
    height:95%;
    overflow: hidden;
}
#buttons {
    position: relative;
    z-index: 1;
    top: -20px;
    display: flex;
    justify-content: center;
}