#hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-around;
    min-height: 90vh;
    box-sizing: border-box;
}
#hero img {
    max-height: 16vh;
}
#hero .logo {
    max-height: 30vh;
    min-height: 30vh;
}
#intro {
    min-height: 100vh;
    padding-top: 6vh;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
}
#intro .bg-elem {
    width: 30em;
    height: 30em;
    border-radius: 50%;
    background: radial-gradient(circle, #0a3943 0%, var(--background) 60%, var(--background) 90%);
    filter: blur(300px);
    position: absolute;
    top: -100%;
    left: 0;
    transition: 0.4s ease-out;
    will-change: transform;
    animation: bg-elem 120s infinite linear;
    transform-origin: 44% 45%;
    z-index: -1;
}

@keyframes bg-elem {
    0% {
        transform: rotate(0deg) scale(100%, 100%);
    }
    25% {
        transform: rotate(180deg) scale(100%, 85%);
    }
    50% {
        transform: rotate(360deg) scale(100%, 100%);
    }
    50.1% {
        transform: rotate(0deg) scale(100%, 100%);
    }
    75% {
        transform: rotate(180deg) scale(100%, 85%);
    }
    100% {
        transform: rotate(360deg) scale(100%, 100%);
    }
}