Change colour of a cell depending on value in a list

[Gtotheurra]

Hello i think this will be really easy for many of you to solve.
What i want is for cell F23 and F24 to turn white or blank if the list in C20 is Ensidig. If the value is Tvåsidig i want it to be grey. (complicated swedish words)

I tried to solve it by using conditional formatting, but i couldnet figure it out :/

Thanks in advance

Sincerely

Gustav

[KOKOSEK]

Clear cells F23/24 (as expected for Ensidig).
Then select both of them and in CF, choose last option in rule setting and put this formula:

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then set grey filling for cells, clikc OK, click OK.
And should works.