Coloring tags with Stylus - content dependent

Hi,

following Frank's life logging post I have created a few habit trackers of my own.

In Stylus css, is there a way to format an element depending on it's content?  I'd like to color tags in Workflowy like this:

#m0 = green #m1 = blue ...

So I need to get the number dynamically, otherwise I'd need to write 100+ styles. What I have:

[title="Filter #m3"] { background-color: #85d500 !important; color: #0000 !important; }

The reason for this is, I'd like to color code my home energy consumption in order to compare if this month's value is above or below average.