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The most challenging part was making the dropdown menu. On top of that switching from a navbar to a sidebar menu on mobile. It was a nice learning experience.

Anotger thing is that, it was a bit tricky to load the specific images for mobile and desktop correctly. I didn't know how to do it using Html, so I had to use Java script to check the screen size and switch the images accordingly.

On the css for the greyed-out background with the Annual Plan details, I think it's be better if everything was evenly spaced and justified by the space between to preserve symmetry, as opposed to the way it's shown in the sample images.

Not really a question, just something i thought I'd add on for design best practices