x/playground: website: Missing color for foreground text

[gopherbot]

by kNiVeS.dev:

This makes it difficult to read text on the light yellow background when no foreground
text color has been defined.
This is a problem when a browser is using colors from a dark GTK theme (light text
color, dark background)

[adg]

Comment 1:

Labels changed: added release-none, repo-playground.

Owner changed to @adg.

Status changed to Accepted.

[adg]

Comment 2:

There is "color:black" specified in the "body" CSS selector. What else can I do to fix
this?

Status changed to WaitingForReply.

[gopherbot]

Comment 3 by kNiVeS.dev:

"color:black" inside "#code" fixes it for me

[adg]

Comment 4:

https://golang.org/cl/100020044

Status changed to Started.

[adg]

Comment 5:

The fix is submitted. I just need to re-deploy the site, which I will do once I get off
this flight.