span.rnav {
    display: inline-block;
    padding: 10px;
    font-size: 2rem;
    border: 5px solid;
    margin: 20px;
    cursor: pointer;
}

span.rnav:hover {
    display: inline-block;
    background-color: var(--fg);
    color: black;
    mix-blend-mode:lighten;
    border: 5px solid;
    opacity: 1;
    padding: 15px;
    margin: 15px;
}