margin-left: 25%
<html> <head> <title>Percentages Demo</title> <style type="text/css"> p {text-indent: -5%; margin-left: 25%; margin-right: 15%; font-size: 150%; </style> </head> <body> <p>This paragraph's font and margins have been set with percentages. The indent was set with a negative percentage.</p> </body> </html>