html, body {
    padding: 0;
    margin: 0;
    background-color: black;
    width: 100vw; 
    height: 100vh;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
}