#back2Top {
    width: 40px;
    line-height: 10px;
    /* overflow: hidden; */
    /* z-index: 999; */
    display: none;
    /* cursor: pointer; */
    position: fixed;
    bottom: 50%;
    right: 10px;
    background-color: #121212;
    /* color: #555; */
    /* text-align: center; */
    /* font-size: 30px; */
    /* text-decoration: none; */
}
#back2Top:hover {
    background-color: #ccc;
    color: #000;
}