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

#gameCanvasContainer{
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    justify-content: center;
    height: 100%;
}
#output {
    font-family: Arial, Helvetica, sans-serif;
    border: 1px solid black;
}  

canvas {
    border: 10px solid gray;
}