style.css

html {
    min-height: 100%; /* Look, it's not fixed anymore! */

    display: flex;
    flex-direction: column;
    overflow: hidden;
    justify-content: center;
    align-items: center;
}

body {
    flex-grow: 1;
    background: black;
}

#canvas{

   /* width: 50vw; 
    height: 80vh; */

    width: 100%; 
    height: 100%; 
    background-color: black;
}

@media (orientation:landscape) {
    .container-sm {
        max-width: 80%;
        height: 95vh;
    }

    .container {
        max-width: 95%;
        height: 95vh;
    }

    .centered {
        margin: 0;
        position: absolute;
        top: 50%;
        left: 50%;
        -ms-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
      }
}

@media (orientation:portrait) {
    .container-sm {
        max-width: 100%;
        height: 93vh;
    }
}