Disable scroll up on mobile devices

Hello. Is it possible to disable the scroll up feature on mobile devices but keep it on the desktop version?

Thanks.

.enigma_scrollup {
    width: 45px;
    height: 40px;
    opacity: 0.5;
    position: fixed;
    bottom: 100px;
    right: 30px;
    display: none;
    border-radius: 2px;
    text-align: center;
    color: #FAFAFA;
    background: rgba(0, 6, 102, 1) none repeat scroll 0% 0%;
    z-index: 9999;
    transition: all 0.5s ease 0s;
}