Responsive e-commerce product page using CSS Flex, Grid, JS

What are you most proud of, and what would you do differently next time?

• I did this without the use of a JS framework, even though a framework would have been faster I think.
• I've done the thumbnail navigation, and then adapted it for the lightbox, and then for the smaller screens.
• Would probably give more though to the css sizes, and try to use rem instead of px where it makes sense.

What challenges did you encounter, and how did you overcome them?

• Creating the thumbnail navigation for the lightbox - did it using data attributes and some DOM traversing.
• Refactoring the thumbnails navigation to work both inside the lightbox and on the smaller screens - it worked with passing the parent container as a parameter to the navigateThumbnails function and adding some optional chaining.
• Adapting the active state for mobile, especially the shopping cart position - did it by using absolute positioning and some translation.

What specific areas of your project would you like help with?

Maybe there is a better way of refactoring the functions and handling the responsiveness.