Linking a CSS Style Sheet to an HTML File
Special characters must be escaped [<] [>]
Did you link the style sheet?
*NOTE: The 2nd link is not mine, it's simply part of the code already given by codecademy that is also getting error highlights.
<!DOCTYPE html> <html> <head> <link href="/style.css" type="text/css" rel=stylesheet"> <link href='https://fonts.googleapis.com/css?family=Roboto:400,300,500,100''rel='stylesheet'type='text/css'> </head>