editor/drawable-anydpi-v21/ic_border_inner_black_24dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M3,21h2v-2L3,19v2zM7,21h2v-2L7,19v2zM5,7L3,7v2h2L5,7zM3,17h2v-2L3,15v2zM9,3L7,3v2h2L9,3zM5,3L3,3v2h2L5,3zM17,3h-2v2h2L17,3zM19,9h2L21,7h-2v2zM19,3v2h2L21,3h-2zM15,21h2v-2h-2v2zM13,3h-2v8L3,11v2h8v8h2v-8h8v-2h-8L13,3zM19,21h2v-2h-2v2zM19,17h2v-2h-2v2z"/>
</vector>