GRAV internally uses SASS, a powerful extension to CSS to generate CSS files. They do wonderful things in CSS, but I found the code too difficult to understand,
I have added a simple CSS file, which extends the image and link types.
The link class is used in all of the TWIG files that show picture links on the screen.
PNHBleft is used in several MD files where an image is shown at the top left, e.g. Conductor bios, to give a consistant appearance to the website.