.mouse {
    border: 2px solid #40ad88;
    border-radius: 13px;
    bottom: 40px;
    display: block;
    height: 46px;
    width: 26px;
}

    .mouse span {
        animation-duration: 0.7s;
        animation-fill-mode: both;
        animation-iteration-count: infinite;
        animation-name: scroll;
        background: none repeat scroll 0 0 #40ad88;
        border: 1px solid transparent;
        border-radius: 4px;
        display: block;
        height: 4px;
        margin: 6px auto;
        width: 4px;
    }

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateY(0px);
    }

    100% {
        opacity: 0;
        transform: translateY(20px);
    }
}