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<!DOCTYPE html> <html> <head> <style type="text/css"> #last-child { height: 40px; margin-bottom: -20px; background-color: blue; } #separator { height: 40px; background-color: green; } #parent { margin-bottom: -10px; } </style> </head> <body> <div id="parent"> <div id="last-child"></div> </div> <div id="separator"></div> </body> </html>