.btt-button {
    display: inline-block;
    height: 40px;
    width: 40px;
    position: fixed;
    bottom: 20px;
    right: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    /* image replacement properties */
    overflow: hidden;
    text-align:center;
    white-space: nowrap;
    background: #fff;
    visibility: hidden;
    opacity: 0;
    -webkit-transition: opacity .3s 0s, visibility 0s .3s;
    -moz-transition: opacity .3s 0s, visibility 0s .3s;
    transition: opacity .3s 0s, visibility 0s .3s;
    z-index:100;
}
.btt-button:after {
    font-family: 'luma-icons';
    content: '\e621';
    position: absolute;
    top: 10px;
    left: 10px;
}
.btt-button .icon-chevron-up{
    align-content: center;
    vertical-align: middle;
    text-align: center;
    color: #000;
    font-size: 20px;
    line-height: 38px;
}
.btt-button.cd-is-visible, .btt-button.cd-fade-out, .no-touch .btt-button:hover {
    -webkit-transition: opacity .3s 0s, visibility 0s 0s;
    -moz-transition: opacity .3s 0s, visibility 0s 0s;
    transition: opacity .3s 0s, visibility 0s 0s;
}
.btt-button.cd-is-visible {
    /* the button becomes visible */
    visibility: visible;
    opacity: 1;
    z-index: 0;
}
.btt-button.cd-fade-out {
    /* if the user keeps scrolling down, the button is out of focus and becomes less visible */
    opacity: .5;
}
.no-touch .btt-button:hover {
    background-color: #000;
    opacity: 1;
}