1 2 3 4 5
<svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 18 18"> <path fill-opacity=".3" d="M1 16h15v-15z"/> <path d="M1 16h7v-7z"/> <path d="M0 0h18v18h-18z" fill="none"/></svg>