iso-profiles-settings/tromjaro/gnome/desktop-overlay/etc/skel/.local/share/gnome-shell/extensions/unite@hardpixel.eu/themes/adwaita-dark/maximize.svg

<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24"  xmlns:v="https://vecta.io/nano"><path d="M8 7v8h8V7zm1 1h6v6H9z" fill="#070707"/><path d="M8 8v8h8V8zm1 1h6v6H9z" fill="#eeeeec"/></svg>