Maximize 48 Filled icon

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 48" width="24" height="24"><path fill="currentColor" d="M6 11.5A5.5 5.5 0 0 1 11.5 6h25a5.5 5.5 0 0 1 5.5 5.5v25a5.5 5.5 0 0 1-5.5 5.5h-25A5.5 5.5 0 0 1 6 36.5v-25ZM11.5 9A2.5 2.5 0 0 0 9 11.5v25a2.5 2.5 0 0 0 2.5 2.5h25a2.5 2.5 0 0 0 2.5-2.5v-25A2.5 2.5 0 0 0 36.5 9h-25Z"/></svg>