Show full banner image on mobile

Hi -- I know this question is asked often and I've looked back at what you've helped me with before and at the other fixes to the issue in this forum, but nothing has worked.

I have two sections on a page with banner images that do not resize for mobile. I want both images to appear full-size on mobile screens

Any help will be greatly appreciated. Thank you!

I see 1 image only. You mean this?

2 hours ago, tuanphan said:

I see 1 image only. You mean this?

These are the two images.... (pictured).... The page is created as an index page with 2 sections. The first image is in the first sections and the 2nd image in the second section.  

17 hours ago, u28h20 said:

These are the two images.... (pictured).... The page is created as an index page with 2 sections. The first image is in the first sections and the 2nd image in the second section.  

Try adding to Design > Custom CSS

@media screen and (max-width:640px) {
body#collection-6312427a6ab8b36e08dd0be5 .Parallax-item img {
    width: 100% !important;
    height: auto !important;
    left: 0 !important;
    top: 0 !important;
}
section#designing-duo-header {
    min-height: unset !important;
    height: 300px;
}
section#designing-duo-info {
    height: 300px;
    min-height: unset !important;
}
}