Font-Awesome/js-packages/@fortawesome/fontawesome-free/svgs/regular/square.svg

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!-- Font Awesome Free 5.15.4 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) --><path d="M400 32H48C21.5 32 0 53.5 0 80v352c0 26.5 21.5 48 48 48h352c26.5 0 48-21.5 48-48V80c0-26.5-21.5-48-48-48zm-6 400H54c-3.3 0-6-2.7-6-6V86c0-3.3 2.7-6 6-6h340c3.3 0 6 2.7 6 6v340c0 3.3-2.7 6-6 6z"/></svg>