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<!DOCTYPE html> <html> <head> <style> body { background-color:#E7E9EB; } #myDIV { height:300px; background-color:#FFFFFF; } #main { width:100px; padding:50px; background-color:lightblue; outline: solid red; outline-width: 10px; } </style> </head> <body> <h1>The outline-width property</h1> <div id="myDIV"> <div id="main"> The outline-width property specifies the thickness of the outline border. </div> </div> </body> </html>