.top {
    position: fixed;
    bottom: 8%;
    right: 3%;
    z-index: 99;
    display: none;
    cursor: pointer;
}


/* mobile */
@media screen and (max-width: 767px) {
    .top img{
        width: 80%;
    }
}


/* tablet */
@media screen and (min-width: 768px) and (max-width: 1024px) {
    .top img{
        width: 90%;
    }
}