Can you spot the mistake in this color-related declaration?

The hash symbol is missing in 00ffff#f0f is too short for a hexadecimal colorfirebrick isn't a standard nameThe border property isn't a shorthand property

Perfect! Hexadecimal colors can be three or six digits in length but they need to start with a hash symbol.

Oh noes! Hexadecimal colors can be three or six digits in length but they need to start with a hash symbol.