.back-to-top {
    background: var(--color-rot);
    position: fixed;
    bottom:50px;
    right:50px;
    padding:1em;
    border-radius: 5px;
    color: Var(--color-white);
    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;    
   }
   @media screen and (max-width: 580px){
    .back-to-top{
        width: 40px;
        height: 40px;
        right:40px;
        bottom:60px;
        padding: 5px;
        text-align: center;
    } 
}