You can use a horizontal rule to separate one section from another.
Below this sentence there is a horizontal rule:
Red colour blindness - affecting 8% of all men!
Look at the image below:
A person who suffers from so-called 'red-blindness' will see the colour of the t-shirt as greenish-brown or brownish-green.
Conclusion? Be careful when you give instructions on a site. E.g. click on the red button may not work for the users mentioned above... .