The guidelines in this topic shouldn't take the place of a graphic designer
assembling or reviewing your design, but they will help you avoid some design
pitfalls when creating a new style or editing an existing one.
Check to make sure...
there is enough color contrast to keep the text readable.
your style elements look good at different zoom levels.
your design is usable to colorblind viewers.
for mobile designs, make sure your design works with Night mode.