Full screen dialog style

style.xml

<style name="YourAlertDialogTheme" parent="Theme.AppCompat.Light.Dialog">
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:windowIsFloating">true</item>
    <item name="android:windowBackground">@color/background_light</item>
    <item name="android:titleTextStyle">@color/main_text_dark</item>
    <item name="android:textColor">@color/main_text_dark</item>
    <item name="colorPrimary">@color/main_light</item>
    <item name="colorPrimaryDark">@color/main_light_darker</item>
    <item name="colorAccent">@color/main_accent</item>
    <item name="android:windowAnimationStyle">@style/DialogAnimation.Window</item>
</style>

<style name="YourAlertDialogTheme.Fullscreen" parent="YourAlertDialogTheme">
    <item name="android:windowIsFloating">false</item>
</style>