org.ntlab.acanthus_client / app / src / main / res / drawable / shape_style.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <stroke
        android:width="1dp"
        android:color="#000000" />
    <solid android:color="@color/white" />
</shape>