html {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

body {
    height: 100%;
    width: 100%;
    overflow: hidden;
    margin: 0px;
    background-color: black;
}

#videoPlayer {
    position: fixed;
    right: 0;
    bottom: 0;
    height: 100%;
    transform: translateX(calc((100% - 100vw) / 2));
    z-index: -100;
}

#button {
    z-index: 100;
}

.center {
    width: 100px;
    height: 100px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -50px;
    margin-top: -50px;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

l {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

li {
    float: left;
    background-color: #333;
}

li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

li a:hover {
    background-color: #111;
}