<html>
   <head>
   </head>

   <body>
      <p style = "margin-bottom: 15px; border:1px solid black;">
         This is a paragraph with a specified bottom margin
      </p>
      
      <p style = "margin-bottom: 5%; border:1px solid black;">
         This is another paragraph with a specified bottom margin in percent
      </p>
   </body>
</html> 

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.