I've closed your parallel question on a custom colour because the answer is the same.
That question is
Quote:
Looks like my choice is limited like living in NK.
if I want to specify a custom colour such as #06a8c4 there is no way
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The answer in both cases is that you your are correct.
You cannot do this directly in Word Online. You can create these elements in the Desktop Version and then edit/use them in Word Online.
Compare Word features on different platforms - Office Support