Thanks for the reply Leo. My current featured images are not very big and making them stretch 100% container width will make them look distorted. Since all the featured images will have same color, i though to apply a background color to the featured image “container” so as to make them look 100% width.
I tried applying background color to .generate-page-header
but this applies it to all the page headers. Tried .single .generate-page-header
but it doesnt seem to work.