.cd-top {
    pointer-events: none;
    z-index: 8;
    display: inline-block;
    height: 40px;
    width: 40px;
    position: fixed;
    bottom: 30px;
    right: 10px;
    box-shadow: 0 0 10px rgba(0,132,255, 0.05);
    border-radius: 40px;
    /* image replacement properties */
    overflow: hidden;
    white-space: nowrap;
    background-color: #fff;
    box-shadow: 2px 4px 10px 0 #33333329;
    opacity: 0;
    color: #dc2321;
    -webkit-transition: opacity .3s 0s, visibility 0s .3s;
    -moz-transition: opacity .3s 0s, visibility 0s .3s;
    transition: opacity .3s 0s, visibility 0s .3s;
}

    .cd-top.cd-is-visible, .cd-top.cd-fade-out, .no-touch .cd-top:hover {
        -webkit-transition: opacity .3s 0s, visibility 0s 0s;
        -moz-transition: opacity .3s 0s, visibility 0s 0s;
        transition: opacity .3s 0s, visibility 0s 0s;
    }

    .cd-top.cd-is-visible {
        /* the button becomes visible */
        visibility: visible;
        opacity: 1;
        pointer-events: all;
    }

    .cd-top.cd-fade-out {
        /* if the user keeps scrolling down, the button is out of focus and becomes less visible */
        opacity: .5;
    }

    .cd-top:hover {
        opacity: 1;
    }