#manudev-toparrow {
    position: fixed;
    cursor: pointer;
    width: 40px;
    height: 40px;
    font-size: 24px;
    text-align: center;
    line-height: 50px;
    border-radius: 50%;
    z-index: 9;
    flex-wrap: wrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease-in-out;
    display: flex;
    justify-content: center;
    align-content: center;
}


#manudev-toparrow.show {
    opacity: 1;
    visibility: visible;
}

#manudev-toparrow.show:hover {
    opacity: 0.8;
}