:root {
        --p-font-size: clamp(1rem, calc(1rem + ((1vw - 0.225rem) * 0.47)), 1.5rem);
} 



a.back-to-top {
    display: none;
    width: 50px;
    height: 50px;
    text-indent: -9999px;
    position: fixed;
    z-index: 3000;
    right: 20px;
    bottom: 20px;
    background: url(_media/Images/back-to-top.png) no-repeat;
}