app/src/main/res/values/dimens.xml
<resources>
<!-- Default screen margins, per the Android Design guidelines. -->
<dimen name="activity_horizontal_margin">16dp</dimen>
<dimen name="activity_vertical_margin">16dp</dimen>
<!-- Default screen margins, per the Android Design guidelines. -->
<dimen name="nav_header_height">160dp</dimen>
<dimen name="img_height">90dp</dimen>
<dimen name="img_width">90dp</dimen>
<dimen name="dots_height">30dp</dimen>
<dimen name="half_margin">8dp</dimen>
<dimen name="standard_margin">16dp</dimen>
</resources>