Space Tourism Website

Was fun doing this challenge, played around with some of the background images to add something to the solution, tried to remove the flex gaps on the destinations page but couldn't seem to find a way without losing the image quality. So, any tips or ideas on that would be great. Also, any ways to make an image within a picture tag fully responsive without manually setting image or parent element size as the view width changes?

As always, any other feedback is always appreciated, thanks for looking.