.footer{
    z-index: 2;
    position: fixed;
    bottom: 0;
    height: 35px;
    padding-top: 3px;
}

.footer-rights{
    font-size: medium;
}

@media (max-width: 391px){  
    .footer-rights{
        font-size: x-small;
    }
}

@media(max-width: 450px){
    .footer-rights{
        font-size: small;
    }
}