<How do I get rid of these white lines surrounding...

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How do I get rid of these white lines surrounding my options menu in Kotlin
I have an options menu on my action bar that opens when the three dots are clicked and changed its colour however although the colour has changed there are bands of white at the top and bottom that I don't know how to get rid of.

https://i.stack.imgur.com/oH3lq.png▾