logindesign_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>
    <dimen name="fab_margin">16dp</dimen>
    <dimen name="ten_margin">10dp</dimen>
    <dimen name="twelve_margin">20dp</dimen>
    <dimen name="thirty_margin">30dp</dimen>
    <dimen name="fourty_margin">40dp</dimen>
</resources>