.footer {
    text-align: center;
    padding: 15px 0;
    background: rgba(0, 0, 0, 0.6);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 14px;
    color: #aaa;
}
@media screen and (max-width: 480px) {
    .footer {
        font-size: 12px;
    }
}