.pageup {
    position: fixed;
    bottom: 28px;
    right: 100px;
    width: 48px;
    height: 48px;
    border-radius: 5px;
    background-color: #3b3b3b;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    opacity: 0;
    transition: all 0.75s;
	z-index: 999;
}

.pageup:hover {
    opacity: 1;
}