#voltarTopo {
    background-color: #D9D9D9;
    border: none;
    border-radius: 50%; 
    bottom: 58px; 
    box-shadow: 0px 0px 8px var(--cor3);
    color: var(--cor4);
    cursor: pointer; 
    display: none; 
    font-size: 16px; 
    outline: none; 
    padding: 12px; 
    position: fixed;    
    right: 40px; 
    z-index: 99;    
}

#voltarTopo:hover {
    background-color: var(--cor1); 
}

#voltarTopo:active {
    background-color: var(--cor2); 
}