Typo error in instructions of responsive web design

so i found a typo error in responsive web design course, in part where we learn css colors by building colored markers, in part 93

here in instruction its written blue, it should be green

Hi there, I cannot see a typo.
Can you point it out somehow?

in the instruction 93, in the 3rd line, first word is blue, it should green or dark green whatever,

Do you mean the phrase “20 for blue”? This is not a typo though?
The colour 20 is supposed to be inserted into the rgb representation for the colour. The red and green and blue colours are represented in hex. And 20 is the value of the blue part of the hex value?

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