body {
    background-image: url('https://w.wallhaven.cc/full/zy/wallhaven-zygeko.jpg');
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
}

#app > header > div > div,
#app > main > div > div,
#app > footer > div {
    background-color: rgba(30, 30, 30, 0.5) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}