Check your CSS code without leaving the IDE by using CssCop, which brings the CSS Lint functionality to the Visual Studio environment.

It is also available for Mac, which makes it easy to deal with HTML/JS/CSS, i.e. client-side technologies. Most developers using Windows and developing for Windows will use Visual Studio IDE ...

If you have an existing web application, open it in Visual Studio Code (preferably copying it to a new development branch) and then use the PWA Studio tools to convert it into a PWA.