A way to syntax-highlight CSS metrics declarations

Here is an idea on how you could syntax-highlight margin, padding, outline and border values in CSS:

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The fourth version of Moscow metro map
I made my first Moscow metro map in 2007. The official map was disgusting then, but nobody cared. My work inspired many designers to try to design their own map
 596   2016
Group characters in password input fields
 473   2013
Ctrl ←Edinburgh and Samara
Ctrl →This is how you write a great title for a blog post