Replace this line with your code.
I am stuck keeps telling me "Oops, try again. Did you remember to include a rel="stylesheet" in your <link> tag? "
please post your code so we can actually help you
As rightly said by @stetim94, please post your codes to help.
However, based on the error, you are asked to link your stylesheet which is done be:
<link rel="stylesheet" type="text/css" href="styles.css">
styles.css is the document containing your CSS code.
Hope this helps!