html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    background-color: black;
}

canvas {
    width: 100%;
    height: 100%;
    background-color: black;
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    border: 0;
}

#midDiv {
    font-size: 20px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform:translate(-50%, -50%);
    color: rgb(154, 205, 50, 80%);
    background-color: rgb(0, 0, 0, 80%);
    padding: 20px;
    border: 1px solid rgb(154, 205, 50, 80%);
}