footer{
    background-color: #333;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: var(--footer-height);
    width: 100%;
    font-size: 12px;
}

@media (min-width: 768px){
    footer{
        font-size: 16px;
    }
}