center it on the page using the margin property.

If it is an image use:

img {
display: block;
margin: 0 auto;
}

If it is, for example, a paragraph, only use margin:

p {
margin: 0 auto;
}

@martinfrank I noticed that you asked two questions in a row that corresponded to the first two questions in the code challenge and were answered by watching the videos leading up to the challenge. Please don't waste an opportunity to learn here at Treehouse by just trying to answer the challenges. Make sure to watch the videos that lead up the questions.

If you are watching the videos, then when you come to ask a question on the forum please post the code that you're already tired so that we can see you are making a valiant attempt. thanks.