<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M464 448H48c-26.5 0-48-21.5-48-48V112c0-26.5 21.5-48 48-48h416c26.5 0 48 21.5 48 48v288c0 26.5-21.5 48-48 48z"/></svg>
info at phpclasses dot org