body {
    margin: 0;
    padding: 0;
    color: rgba(255, 255, 255, 0.87);
    background-color: #000000;
}

canvas {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translateY(-50%) translateX(-50%);
    transform: translateY(-50%) translateX(-50%);
}

#startButton {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translateY(-50%) translateX(-50%);
    transform: translateY(-50%) translateX(-50%);
    width: 200px;
    height: 50px;
    font-size: large;
    background-color: black;
    border-radius: 10px;
    border: 2 solid white;
    color: white;

}