.idiomaCascada{
    position: fixed;
    bottom: .5rem;
    right: .5rem;
    z-index: 90;
    padding: .5rem 1rem;
    background: linear-gradient(0, #e9eeec, #fcfffe);
    border-radius: .5rem;
    border: 1px solid #ddd;
    font-size: clamp(.8rem, 2vw, 1rem);
    cursor: pointer;
    color: #555;
}
.idiomaCascada option{
    background: #555;
    color: #fff;
    font-size: .7rem;
}

@media(max-width:500px){
    .idiomaCascada{
        left: 50%;
        transform: translate(-50%);
        right: unset;
    }
}