Some feedback if you want:
- You're overdoing it with the shadows. Simple flat design looks cleaner
- A little too many colors, that are not really aligned with each other. If you're not a designer, check out Tailwind colors and pick 1-2 you like that work complementary. Only use those and white/black/grey.
- For further reading on color picking, read up about the 60/30/10 rule in color design
- Since you've built your site with react, you could think about adding some simple animations (for example, when the books are switched on "next-book" button) by using Framer Motion. This is an opinionated thing from me.
Cool project, good start in the indie hacking community :) Keep doing cool stuff. If you wanna connect, find me on Twitter: @icebearlabs