body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #000;
}

canvas {
    position: absolute ;
    top: 50px;                  
    left: 0;
    width: 100vw ;
    height: calc(100vh - 50px) ;
    margin: 0 ;
}

#banner-ad {
    position: fixed ;
    top: 0 ;
    left: 50% ;
    transform: translateX(-50%);
    z-index: 2147483647 ;
    width: 100% ;
    display: flex ;
    justify-content: center ;
    min-height: 50px ;
    background: transparent;
}