Set background-color to the value black.

<html> <head> <style> body { background-color: black; } h1 { font-family: Helvetica; color: red; } p { color:white; } </style> </head> <body> <h1>Homeflix</h1> <p>Watch anywhere.</p> </body> </html>]]>

Make sure to type background-color: black;.