Why doesn't this background entry work?

Question

css

background: url(../img/header_bg.jpg) no-repeat center center cover ;
You need to transfer cover (bgsize:cover) and it will work, why?

Answer 1

Because according to the specification, background size should come after bg position and be separated by a slash. Try:

background: url(../img/header_bg.jpg) no-repeat center/cover;