.simple-scroll-up-btn {
    width: 64px;
    height: 64px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    transition: all .3s;
    position: fixed;
    bottom: 4px;
    right: 4px;
    z-index: 99999;
}

.simple-scroll-up-btn>svg {
    width: 48px;
    height: 48px;
    fill: #fff;
}

.simple-scroll-up-btn:hover {
    cursor: pointer;
    transform: translateY(-8px);
    transition: all .3s;
}