I feel like an idiot, but never having done anything resembling programming since college Computer Science.  Which was 25 years ago this fall:
If I want spoiler font to show up in a color other than white, I click on "Edit personal css."  Then, in the box, I type in (or C&P from P-C's post)
.spoiler {
color: #FFFFFF;
replacing #FFFFFF with the color code of my choice (from P-C's link).  Correct?  My computer won't explode?
	
 
		
		
You'll need to close it
.spoiler {  color: #FFFFFF; }
	
 
		
		
Thanks, Deena.  Let me give it a try.
	
 
		
		
Fred, that's exactly what I did.  I didn't even close it and it worked fine. 
This whole experience reminds me of when I first arrived at this board and realized that I would have to learn some HTML if I was ever going to post a link - initially painful but ultimately a good skill to have.
	
 
		
		
Fred, that's exactly what I did. I didn't even close it and it worked fine.
Please close it. Someday, you may be using a browser that (correctly) ignores your css addition, and you'll spend way too much time trying to figure out why.
	
 
		
		
Oh, I did later (and just doubled checked).  I had no idea what I was doing at first so I was just copying and pasting but eventually I noticed (in my spoiler problem last night) that there was a missing }.
	
 
		
		
Did the style sheet change since yesterday?  Because when I opened it here at work, it looked completely different than when I opened it on my home computer.  For one things, I don't see any % or what looks to be formatting.  Also, every line has a font indicated.  Weird.  I wonder if this is causing the problem I'm having getting the screen to look right.
	
 
		
		
I set it up (including closing), but I'm not sure I did what I wanted to.  I'm trying to set it up so I can see spoiler font without highlighting, but in a different color so I know what's in spoiler font.  I now have the different color but I still have to highlight.  What I have is
.spoiler { #817679; }
, but I'll probably experiment with color.
	
 
		
		
You need to do
 .spoiler {color: #817679;}
The color bit is necessary.
	
 
		
		
There have been no style sheet changes (right, Jon?) since yesterday.