MathsCalc / app / src / main / res / drawable / shape_gray_border.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <stroke android:color="@color/line" android:width="0.2dp" />

    <corners android:radius="5dp" />
</shape>