This paragraph will be set to 5% for both the left and right margins. This means that this block of text will take up 90% of the "center" of the page with a 5% margin on each side.

I am setting up the text in this block of text to have left and right margins of 25%. This means that the block of text will occupy the center 50% of this page with a 25% margin on each side.

You can also add padding to the top and bottom of the page by using "margin-top" and "margin-bottom". We will cover margin-top and bottom in our next example.