Color plain text files

Hello. I’m new to atom. I’m looking to color lines that start with hashes in my text file into a certain color (say blue). And lines that start with “=” into another color (say brown)

I tried doing this in the stylesheet based on the discussions here, but it changes all my text which is not what i’m looking for.

.syntax–text {
color: green;
}

Pressed submit too fast… Looking for any advice. Thank you !