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<!DOCTYPE html> <html> <head> <style> #myDIV { background-color: lightblue; } </style> </head> <body> <h1>Change margin-bottom with JavaScript</h1> <div id="myDIV"> This is my DIV element. </div> <p>Click the "Try it" button to change the bottom margin of the DIV element:</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myDIV").style.marginBottom = "100px"; } </script> </body> </html>