The 'custom css and js loader' extension for vscode is pretty good. since most of the editor is rendered with HTML you can pretty much do anything you want, pai

The 'custom css and js loader' extension for vscode is pretty good. since most of the editor is rendered with HTML you can pretty much do anything you want, pairs nicely with the built-in dev console and easier/quicker to iterate than doing things the 'proper way' via extensions/api.