.mouseDown {
    font-size: 0.9em;
    border: 2px solid rgba(255, 255, 255, 1);
    display: block;
    width: 25px;
    height: 40px;
    border-radius: 0.9em;
    margin: 0 auto;
    text-decoration: none;
    transition: border 0.2s ease-out;
    position: absolute;
    bottom: 0;
    left: calc(50% - 1.7em);
}

.mouseDown:hover {
    border: 2px solid rgba(255, 255, 255, 0.7);
}

.mouseDown span {
    display: block;
    background: #fff;
    width: 0.2em;
    height: 0.3em;
    margin: 0.7em auto 0;
    border-radius: 0.4em;
}

.mouseDown span {
    -webkit-animation-name: scroll;
    animation-name: scroll;
    -webkit-animation-duration: 1.5s;
    animation-duration: 1.5s;
    -webkit-animation-timing-function: cubic-bezier(0.65, -0.55, 0.25, 1.5);
    animation-timing-function: cubic-bezier(0.65, -0.55, 0.25, 1.5);
    -webkit-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
    will-change: transform;
}

.mouseDown:hover span {
    -webkit-animation-duration: 0.7s;
    animation-duration: 0.7s;
}

@-webkit-keyframes scroll {
    0%, 20% {
        -webkit-transform: translateY(0) scaleY(1);
    }
    10% {
        opacity: 1;
    }
    100% {
        -webkit-transform: translateY(1.2em) scaleY(1.5);
        opacity: 0.01;
    }
}

@keyframes scroll {
    0%, 20% {
        transform: translateY(0) scaleY(1);
    }
    10% {
        opacity: 1;
    }
    100% {
        transform: translateY(1.2em) scaleY(1.5);
        opacity: 0.01;
    }
}