html {
    background-image: url(landingback.jpg);
    background-repeat: no-repeat;
    background-size: cover;
}
h1 {
    color: white;
    text-align: center;
    margin-top: 3%;
}
#container {
    border: 5px, grey, solid;
    width: 70vw;
    background-color: black;
    text-align: center;
    margin: auto;
    margin-top: 30vh;
    padding: 2%;
    color: white;
}
img.enter {
    display: block;
    margin: auto;
    max-width: 100vw;
}