We’ve found this website mock-up in Figma community. And we liked it so much so decided to make a WordPress theme from it. This theme is responsive and adapted for mobile devices. We used such features like source set for images. And in result we have very fast loading WordPress theme. We started using underscores starter theme.

Demo: book

Code: https://github.com/alex-255/book-theme

More about how this theme was created in our blog.