Using the instructions, you can have a minimalistic experience of the D&D Beyond website and the digital 5e compendiums.
There’s also instructions for getting a minimalistic experience using your current Chrome browser (either on PC/Mac or Chrome OS).
This repository keeps track of the CSS, JS and icon files used in the project. Check out the forum post on DDB for more information on how to build your own, and customize.
I AM NOT AFFILIATED WITH CURSE OR D&D BEYOND PRODUCT, THIS IS A PERSONAL PROJECT BUILT ON FREE SOFTWARE.