index.css

*,
*::after,
*::before {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

html,
body {
    height: 100svh;
    background-color: #111111;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    position: relative;
    overflow: hidden;
}

h1 {
    width: 100%;
    text-align: center;
    padding: 2rem;
    font-weight: 700;
    font-size: 2rem;
    color: #666666;
    margin-top: 2rem;
    user-select: none;
    cursor: pointer;
    transition: color 150ms;
}

h1:hover {
    color: white;
    transition: color 150ms;
}

a {
    color: white;
    padding: 1rem;
    margin-bottom: 2rem;
    text-decoration: none;
    transition: scale 300ms;
    z-index: 9999;
}

a:hover {
    scale: 1.25 1.25;
    transition: scale 300ms;
}

#tectus {
    position: absolute;
    animation: swing 5000ms ease-in-out infinite;
}

@media (prefers-reduced-motion) {
    #tectus {
        animation: none;
    }
}

@keyframes swing {
    0% {
        transform: translateX(0%);
    }
    33% {
        transform: translateX(-25%);
    }
    67% {
        transform: translateX(25%);
    }
    100% {
        transform: translateX(0%);
    }
}