.scroll-down {
    opacity: 1;
    -webkit-transition: all .5s ease-in 3s;
    transition: all .5s ease-in 3s;
}

.scroll-down {
    position: absolute;
    bottom: 25px;
    left: 45%;
    margin-left: -16px;
    z-index: 2;
    -webkit-animation: bounce 2s infinite 2s;
    animation: bounce 2s infinite 2s;
    -webkit-transition: all .2s ease-in;
    transition: all .2s ease-in;
    transform: scale(1)
}



@keyframes  bounce {
    0%,
    100%,
    20%,
    50%,
    80% {
        -webkit-transform: translateY(0);
        -ms-transform: translateY(0);
        transform: translateY(0);
    }
    40% {
        -webkit-transform: translateY(-10px);
        -ms-transform: translateY(-10px);
        transform: translateY(-10px);
    }
    60% {
        -webkit-transform: translateY(-5px);
        -ms-transform: translateY(-5px);
        transform: translateY(-5px);
    }
}