Can I create a hover effect over a background image?

Site URL: https://alligator-buffalo-slhk.squarespace.com/projects-1

Hi, Does anyone know if i can create a hover effect on a background image using CSS ?  (as opposed to an image block). I want to create a white overlay on all backgrounds on this page,  

https://alligator-buffalo-slhk.squarespace.com/projects-1

... and only reveal full colour of image on hover.

(We are using full bleed backgrounds, rather than image blocks, to achieve a transparency on the header)

-Andrew

Your site is private. can you setup password & share url?

ok, that's done @tuanphan  password is : assist

16 hours ago, andrewmel said:

ok, that's done @tuanphan  password is : assist

Add to Page Settings > Advanced > Header

<style>
  #page section .section-background:after {
    background: rgba(255,255,255,0.75);
    content: "";
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 999;
}
  #page section:hover .section-background:after {
    opacity: 0;
}
</style>

fantastic, thankyou ! @tuanphan