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<!DOCTYPE html> <html> <head> <style> #myDiv { border: thick solid blue; } </style> </head> <body> <div id="myDiv">This is a div.</div> <br> <button type="button" onclick="myFunction()">Change color of the bottom border</button> <script> function myFunction() { document.getElementById("myDiv").style.borderBottomColor = "red"; } </script> </body> </html>