#back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    z-index: 9999;
    width: 32px;
    height: 32px;
    text-align: center;
    line-height: 30px;
    background: grey;
    color: #252525;
    cursor: pointer;
    border: 0;
    border-radius: 2px;
    text-decoration: none;
    transition: all 1s ease-out;
    opacity: 0;
	display : none;
}
#back-to-top:hover {
    background: white;
}
#back-to-top.show {
    opacity: 1;
    display : block;
}
#content {
    height: 2000px;
}