Widget.AppCompat.Button colorButtonNormal shows gray

Question

I have values:styles.xml with:

Use android:theme, not style in buttons definitions:

See AppCompat v21 > Theming and Android Support Library v22.1 - AppCompat blog posts. (note on second post, android:theme is supported on API11-, it just doesn't do automatic inheritance from parent, you will have to specify it on each child, not an issue here but worth mentioning - see Chris Banes' post on that).