Improve CSS for HTML

[tomschr]

Is your feature request related to a problem? Please describe.

The current look of my HTML pages are a bit... boring. Furthermore, it should be readable on smartphones and desktop PCs.

• [ ] improve CSS
• [ ] take into account smartphones
• [ ] use grid(s) to describe the layout
• [ ] use alternative stylesheets?

Describe the solution you'd like

• https://gridbyexample.com/examples/
• https://developer.mozilla.org/en-US/docs/Web/CSS/Alternative_style_sheets