Create 2 CSS variables
--primary-font-weight
and --secondary-font-weight
in root.
Give --primary-font-weight a
value of 900 and
--secondary-font-weight a value
of 400.
Add font-weight property with
the value of --primary-font-weight
to h1 tag.
Similarly, add the same property,
with the value of --secondary-font-weight
to p tag.