style.css

@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@300&display=swap');
body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: Verdana;
    background-color: #1c1b1b;
}


h1 {
    font-family: 'Roboto Mono', monospace;
    font-size: 3em;
    text-align: center;
}

h2 {
    font-family: 'Roboto Mono', monospace;
    font-size: 2em;
    color: #000000;
    text-align: center;
}
.loader {
    position: relative;
    width: 80px;

}
.loader span {
    width: 21px;
    height: 21px;
    display: inline-block;
    background-color: #fff;
    animation: square 2s linear infinite;

}
@keyframes square {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(25px);
        opacity: 0;
    }

}
.loader span:nth-child(2) {
    animation-delay: 0.4s;
}   
.loader span:nth-child(3) {
    animation-delay: 0.8s;
}
.loader span:nth-child(4) {
    animation-delay: 1.2s;
}
.loader span:nth-child(5) {
    animation-delay: 1.6s;
}
.loader span:nth-child(6) {
    animation-delay: 2s;
}