How to change side menu background color in ionic 4?

I use ionic 4 and want to change the background color of side menu I change the background color of the list inside the menu and also change background color of item also but it shows a white background strip of item

thats a list bottom border you have to add lines=“none” in your item component

yes I know this but its not border background color is change but only ion-item background is not change I inspect and check then in ion-item automatically tag is added and its background color is white .