<!DOCTYPE html> <html> <head> <style type="text/css"> fieldset { height: 20px; padding: 0; border: none; background-color: green; } #top { margin: 0 0 10px; } #middle { margin: 20px 0; } #bottom { margin: 10px 0 0; } </style> </head> <body> <fieldset id="top"></fieldset> <fieldset id="middle"></fieldset> <fieldset id="bottom"></fieldset> </body> </html>
