.btn-rb {
    background-color: #1f1f24;
    text-transform: uppercase;
    color: white;
    border: 0;
    padding: 9px 18px;
    font-size: 14.5px;
    font-weight: 400;
    font-family: "Oswald-Medium","HelveticaNeueBold","Helvetica Neue","TeXGyreHerosBold","Helvetica","Tahoma","Geneva","Arial",sans-serif;
}

.btn-rb:hover {
    background-color: #000;
}