Tell me answer with details please

Question

Fill in the blanks to make the background color of the element with id="mystyle" black using hexadecimal color definition.

__________ { background-color: #000000; }

Answer 1

#mystyle{ background-color: #000000;}

this is a very basic css concept just revise your css concepts once again.

Answer 2

Thanks rkk and Gaurav
And I will revise definitely first I completely course

Answer 3

#mystyle