.scroll-up-btn{
    height: 45px;
    width: 42px;
    background: black;
    position: fixed;
    right:30px;
    bottom: 10px;
    text-align: center;
    line-height: 45px;
    color: aliceblue;
    z-index: 9999;
    font-size: 30px;
    border-radius: 6px;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}
.scroll-up-btn.show{
    opacity: 1;
    bottom: 30px;
    pointer-events: auto;
}