My question is similar to this one but the answer given there is for Vim and I need one for VS Code. I'm a real newbie, and I tried to solve this myself, but these attempts failed me:
Markdown Preview GitHub Styling - Says it allows user-defined custom css, but it styles html preview, not the text in the editor
Markdown Theme Kit - Points to custom .css files, but the included ones don't tell me how to do it differently for different heading levels
Markdown Header Coloring - Claims to do exactly this, but when I try to put in user-defined css to give each heading level a different color, I still get color changes between headings of the same level, even after closing/restarting VS Code.
Help is very appreciated.