mintris/app/src/main/res/drawable/rounded_button.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    
    <solid android:color="#444444" />
    
    <corners android:radius="8dp" />
    
    <stroke android:width="1dp" android:color="#666666" />
    
    <padding
        android:left="16dp"
        android:right="16dp"
        android:top="8dp"
        android:bottom="8dp" />
        
</shape>