How to make a background image on cover page responsive?

[Vicki]

Hi everyone,

I am trying to make a cover page for our website(a closed community).

I'd like to insert a background image for this cover page. How to make the background image shown as responsive - to cover entire background of the page all the time?

Can this be easily done? Thanks!

 

[Jake Bunce]

http://www.w3schools.com/cssref/css3_pr_background-size.asp

 

[Vicki]

Thanks Jake! It helps to expand the pic by specifying a bigger size. But it is still not responsive...