#canvas1 {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600;
    height: 600;
}

.controls {
    position: absolute;
    z-index: 10;
    top: 100px;
    left: 50%;
    transform: translateY(-50%);
}

.controls, select, option {
    font-size: 25px;
}