Images not displaying in Safari 9 after CSS fix

Images are not displaying in Safari 9.

I am using The7 theme by Dreame Theme.

I’ve added the following to my CSS which has partially solved the issue:

html:not(.mobile-true) #main img:not(.animate-element, .ls-s-1),
html:not(.mobile-true) #header img,
html:not(.mobile-true) #bottom-bar img {
    opacity: 1 !important;
}

After adding the code, images on this page are displaying correctly:
LearningField Home

Images on this page are still not displaying correctly (hover elements displaying fine):
Testimonials

Removing this stylesheet fixes the issue:
Stylesheet

Any help would be greatly appreciated!