body {
    margin: 0;
    overflow: hidden;
    background: black;
}
#container {
    width: 100vw;
    height: 100vh;
}
#ui {
    position: absolute;
    top: 10px;
    left: 10px;
    color: white;
    background: rgba(0, 0, 0, 0.7);
    padding: 10px;
    border-radius: 5px;
}
.hide{display: none;}