body {
    background: linear-gradient(60deg, skyblue, 70%, blue) no-repeat fixed;
    background-size: cover;
    overflow: hidden;
}

canvas {
    background-color: aliceblue;
    border-radius: 20px;
}

#instructions {
    position: absolute;
    left: 20px;
    border: 3px dashed orange;
    padding: 4px;
    pointer-events: none;
}

#check {
    position: absolute;
    display: none;
}

#reset {
    position: absolute;
}