div#up_button:hover {box-shadow: 3px 3px 9px 0 rgba(0, 0, 0, 0.42);background-color: var(--color-blue);}
div#up_button {
    position: fixed;
    border-radius: 10px;
    right: 25px;
    bottom: 20px;
    background-color: var(--color-href-on-white);
    width: 44px;
    height: 44px;
    box-shadow: 3px 3px 10px 0 rgba(101, 101, 101, 0.39);
    transition: var(--transition-duration);
    cursor: pointer;
    z-index: 1112;
}
div#up_button.up-btn-hide {
    transform: translateY(120px);
    -webkit-transform: translateY(120px);
}
div#up_button div {
    border: solid white;
    border-width: 0 5px 5px 0;
    display: inline-block;
    padding: 5px;
    border-radius: 3px;
    margin: 17px 14px;
    transform: rotate(-135deg);
    -webkit-transform: rotate(-135deg);
}