Next, switch to the activity_main.xml file and add this new style to each EditText in the layout.

<resources xmlns:android="http://schemas.android.com/apk/res/android">
  <style name = "CustomEditText">  
</resources>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <EditText
        android:id="@+id/nameField"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:hint="@string/hint_name"
        android:textSize="20sp"
        android:textColor="@color/dark_green" 
         android:style name = "CustomEditText"     />

    <EditText
        android:id="@+id/cityField"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@id/nameField"
        android:hint="@string/hint_city"
        android:textSize="20sp"
        android:textColor="@color/dark_green"
        android:style name = "CustomEditText"      />

</RelativeLayout>