Please help us help you and fill where relevant:
Your LimeSurvey version: 3.27.9+210726 (yes, I know - I'm trying to get my admin people to update)
Own server or LimeSurvey hosting: Own server
Survey theme/template: fruity
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Hello all,

I see here  that it is possible to change the colour of some sections of an array. However, this thread doesn't show how to colour a single response option in an array. In my survey, I have a "I don't understand" option at the end of a Likert scale. We're concerned about people accidentally clicking "I don't understand", mistaking it for the first item in the Likert scale. So we'd like to shade that option to distinguish it from the others (see the "Current" and "Desired" images attached). Can this be done? Can anyone write me a short piece of code (and tell me where to add it - I have no experience with the backend/code sections in LS). 

Many thanks,

Peter

Try placing something like this in the source of the question text.