html, body {
    padding: 0;
    margin: 0;
    background: #000000;
    overflow: hidden;
}

#preloader {
    color: white;
    position: fixed;
    left: 50%;
    top: 50%;
    translate: -50% -70%;
}

#preloader-progress {
    text-align: center;
    font-size: 2vw;
    font-family: sans-serif;
}

@keyframes loading-loop {
    0%, 66%, 100% { opacity: 0.2; }
    30%, 36% { opacity: 1; }
}
#preloader-animation>* { 
    opacity: 0.05; 
    font-size: 10vw;
}
#preloader-animation :nth-child(1) { animation: loading-loop 1s 0.3s infinite linear; }
#preloader-animation :nth-child(2) { animation: loading-loop 1s 0.4s infinite linear; }
#preloader-animation :nth-child(3) { animation: loading-loop 1s 0.5s infinite linear; }