How to fill the entire store with multiple column images and place buttons on the images?

Store Design
,
1

Obviously, the second image looks lighter and neater. I tried adjusting many parameters, but it didn’t work, even with CSS ,thank you so much.(Dawn 15.0.2)

66.png
66.png1231×613 471 KB

77.png
77.png1839×605 194 KB

2

Hi @6781 , can you share your store url?