html {
    scroll-behavior: smooth;
}

a#scroll-down-btn {
    position: absolute;
    height: 4em;
    width: 2.5em;
    border: 0.2em solid #ffffff;
    margin: auto;
    left: 0;
    right: 0;
    bottom: 2em;
    border-radius: 2em;
}

a#scroll-down-btn:before {
    position: absolute;
    content: "";
    margin: auto;
    left: 0;
    right: 0;
    top: .5em;
    height: .5em;
    width: .5em;
    background-color: #ffffff;
    border-radius: 50%;
    animation: move-down 2s infinite;
}

@keyframes move-down {
    80% {
        opacity: 0.5;
    }
    100% {
        transform: translateY(2.2em);
        opacity: 0;
    }
}

a#scroll-down-btn:after {
    position: absolute;
    content: "scroll down";
    width: 12em;
    display: block;
    text-align: center;
    left: -4.8em;
    top: -2em;
    font-size: .875rem;
    color: #ffffff;
    font-weight: 600;
}

@media screen and (max-width: 992px) {
    a#scroll-down-btn {
        visibility: hidden;
    }
}