<resources>
    <style name="SFMaterialTextBoxHintAppearance" parent="TextAppearance.Design.Hint" >
        <item name="android:textSize">15dp</item>
    </style>

    <style name="SFMaterialTextBoxErrorTextAppearance" parent="TextAppearance.Design.Error" >
        <item name="android:textSize">15dp</item>
    </style>
</resources>