Project Tracker Page - HTML and CSS only

Choosing to make this without JS was a challenge.

// With a pure CSS mobile navigation I used an anchor tag with an href of 'index.html' to enable the 'X' state. While it seems to work, I wonder if there is a way of doing this without reloading the index page and using the loaded page anchors?

// Used the :before pseudo element to create the rounded cropped box in back so as not to add unnecessary non-semantic elements to the DOM.

// It would be nice to get my React skills going for a future challenge. Wondering how should I begin this move toward a more componential skillset?