WebAim's recommendations for accessible CSS

Now attempting to fix some of the font issues I had the first time around, and also applying colors.
Here's a nice simple doc with examples of CSS dos and don'ts
https://webaim.org/techniques/css/#maincontent

Website for up-to-date information on accessibility

Looking at this page
Best Fonts to Use for Website Accessibility by the Bureau of Internet Accessibility
https://www.boia.org/blog/best-fonts-to-use-for-website-accessibility
which will also answer your questions about specific fonts.
Their blog
https://www.boia.org/blog#main-content
has an amazing amount of up-to-date information, including
this post
Enhanced Braille Support Now Available for Google Docs
https://www.boia.org/blog/enhanced-braille-support-now-available-for-google-docs

Of course I've subscribed to their blog.

Re: my webpage on GitHub: What does it mean "Echo is on"?

When I try to look at kestrell7.github.io all I hear is Jaws saying "Echo is on." Over the past week I've been learning some Git bash commands using Coursera and bitbucket, and I'm wondering if something got reset somehow?

My older kestrell13.github.io website, which I haven't updated in over a week, is still there and sounds okay.

What does echo on GitHub refer to?