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>
    <!-- HEADER -->
    <dimen name="header_big_height">100dp</dimen>
    <dimen name="header_small_height">56dp</dimen>
    <dimen name="header_big_text_size">30sp</dimen>
    <dimen name="header_small_text_size">20sp</dimen>
    <dimen name="header_padding">8sp</dimen>

    <!-- MAIN -->
    <dimen name="main_margin">32dp</dimen>
    <dimen name="main_margin_small">20dp</dimen>
    <dimen name="main_padding">32dp</dimen>
    <dimen name="main_padding_small">20dp</dimen>
    <dimen name="main_small_text_margin_top">43dp</dimen>
    <dimen name="main_small_text_below_heading_margin">20dp</dimen>
    <dimen name="main_small_text_margin_start">5dp</dimen>
    <dimen name="main_small_text_margin_end">5dp</dimen>
    <dimen name="main_button_margin_top">8dp</dimen>
</resources>