html, body, #tresgroschatchat, #groschatchat {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
}

body {
    background-color: black;
}

#tresgroschatchat {
    background-size: cover;
    background-position: center center;
    display: none;
    filter: blur(10px);
}

#groschatchat {
    position: absolute;
    top: 0;
    left: 0;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center center;
    display: none;
}