Changing image aspect to fit in the video catalogue

Hi there, I am trying to change the size of the images on the video catalogue so that they fit the aspect of a YouTube thumbnail and don't have black bars at the top and bottom. I have tried lots of different CSS but none of them seem to work. Help would be greatly appreciated.

@tuanphan your code has helped me in so many different areas of my website, possibly you could work your magic on my issue directly this time. The same goes for @creedon. Any help would be very greatly appreciated.

Thank you in advance.

Can you share link to page where you have problem? We can check easier

Sure:

https:/arcforum.com/videos

You try this code to Website > Website Tools > Custom CSS

.lessons.collection-content-wrapper .grid-item .grid-item-image {
    transform: scale(1.2) !important;
}

Thank you for your help, however when I did that, it just zoomed in the image so now the left and right hand sides are being hidden because the frame is too small.

Is there a way to just change the height of the frame so that it fits without cropping the image?

I'm trying to change the aspect ratio to 16:9 so that it is the same as a YouTube thumbnail.