.ybt-top {
    display: inline-block;
    height: 40px;
    width: 40px;
    position: fixed;
    bottom: 40px;
    right: 10px;
    -webkit-box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    /* image replacement properties */
    overflow: hidden;
    text-indent: 100%;
    white-space: nowrap;
    background: rgba(232, 98, 86, 0.8)url(../img/ybt-top-arrow.svg) no-repeat center 50%;
    visibility: hidden;
    opacity: 0;
    -webkit-transition: opacity .3s 0s, visibility 0s .3s, background-color .3s 0s;
    transition: opacity .3s 0s, visibility 0s .3s, background-color .3s 0s;
}

.ybt-top.ybt-top--show,
.ybt-top.ybt-top--fade-out,
.ybt-top:hover {
    -webkit-transition: opacity .3s 0s, visibility 0s 0s, background-color .3s 0s;
    transition: opacity .3s 0s, visibility 0s 0s, background-color .3s 0s;
}

.ybt-top.ybt-top--show {
    /* the button becomes visible */
    visibility: visible;
     opacity: .5;
}

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

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

.ybt-top {
    height: 60px;
    width: 60px;}