.cd-top {
    display: inline-block;
    height: 40px;
    width: 40px;
    position: fixed;
    bottom: 40px;
    right: 10px;
    overflow: hidden;
    text-indent: 100%;
    white-space: nowrap;
    background: url(../images/top_arrow.png) no-repeat center 50%;
    visibility: hidden;
    opacity: 0;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    transition: all 0.3s;
}
.cd-top.cd-is-visible {
    /* the button becomes visible */
    visibility: visible;
    opacity: 1;
}
.cd-top.cd-fade-out {
    opacity: .6;
}
.no-touch .cd-top:hover {
    background-color: #6c757d;
    opacity: 1;
}
@media only screen and (min-width: 768px) {
    .cd-top {
        right: 20px;
        bottom: 20px;
    }
}
@media only screen and (min-width: 1024px) {
    .cd-top {
        height: 60px;
        width: 60px;
        right: 30px;
        bottom: 30px;
    }
}