html, body {
    position: absolute;
    top: 0;
    left: 0;
    margin:0;
    padding: 0;
    height:100%;
    width:100%;
    overflow:hidden;
}
body {
    display: flex;
    align-items: center;
    justify-content: center;
}
canvas {
    background-color: #000;
    width: 1280px;
    height: 720px;
    background-size: 32px;
}
img{
    display:none;
}