tachiyomi/app/src/main/res/values-v27/themes.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="Theme.Tachiyomi.Light.Api27">
        <item name="android:statusBarColor">@color/md_white_1000</item>
        <item name="android:windowLightStatusBar">true</item>

        <item name="android:navigationBarColor">@color/md_white_1000</item>
        <item name="android:windowLightNavigationBar">true</item>
    </style>

</resources>