.RoundButton {
    display: inline-block;
    border: 1px solid white;
    border-radius: 50%;
    background: transparent;
    color: white;
    text-align: center;
    font-size: 16px;
    outline: none;
}

@media(min-width: 1650px) {
    .RoundButton {
       font-size: 32px;
    }
}