html,
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: black;
    height: 100%;
    touch-action: manipulation;
}

.keep-ratio {
    position: fixed;
    inset: 0;

    width: 100vw;
    height: 100vh;

    object-fit: contain;
}

.tap-effect {
    position: fixed;
    width: 120px;
    /* effect size */
    height: 120px;
    pointer-events: none;
    transform: translate(-50%, -50%);
    z-index: 20;
}