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<!DOCTYPE html> <html> <head> <style> h1 { border-bottom: 5px solid red; } h2 { border-bottom: 4px dotted blue; } div { border-bottom: double; } </style> </head> <body> <h1>A heading with a solid red bottom border</h1> <h2>A heading with a dotted blue bottom border</h2> <div>A div element with a double bottom border.</div> </body> </html>