The border-width property is used
to specify the thickness of the borders.
For specifying values, we can
use the standard absolute or relative units
or we can use values like thin, medium or thick.
When this property is not set,
a medium border appears by default.
An interesting point that
we need to remember is that
without the border-style property,
the border-width will not work.
Try removing border-style for
any div in the example given above.