body {
    margin: 0;
    padding: 0;
    background-color: #4c4c4c;
    height: 100vh;
    display: grid;
    place-items: center;
}

.emscripten {
    padding-right: 0;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

canvas {
    border: 0px none;
    background-color: black;
    width: 800px;
    height: 600px;
}