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Unknown named color

Hello, everyone. I’m a beginner at Pavlovia and Psychopy.

Now I’m planning to make a task. In a certain routine of the task, I want to show two frames with two counterbalanced colors(yellow and blue) based on a randomized number.
I can activate my program in Local, in Pavlovia the frames are shown in Black.
Here is the error and the written code for JS(also the ideal frames from Local).
Actually, I looked at relevant questions here. But I do not understand what I should do.
Could you tell me how to make “color” in the code component?

flag = Math.floor(Math.random()*2)

↑ I made a randomized number and a variable.

if flag == 0:
polygon_2.lineColor= ‘yellow’
polygon_3.lineColor= ‘blue’
polygon_2.lineColor= ‘blue’
polygon_3.lineColor= ‘yellow’

I want to show two frames such as the following screen.

For defining colours in code for online use I’d recommend setting them up in a Both component, e.g.

Python: blue = [-1,-1,1]
JS: blue = new util.Color([(-1),(-1),1]);

See my crib sheet.

Then you can use polygon_2.lineColor= blue (no quotes)

Thank you so much.
With your code, it works well!
(Also without quotes.)