If you don't know the difference between padding and margins in web page documents, you're not alone.
How To Adjust the Content, Padding, Border, and Margins of an HTML
When to use Padding and Margin. Small details really matter.
The Difference Between Padding & Margin
CSS padding vs margin: What's the difference?
CSS Margin vs. Padding: What's the Difference?
Padding vs Margin – What's the Difference? - Shiksha Online
What you need to know about the box model (editing margin, padding
WebD2: Understanding the Box Model in CSS
CSS Box Model Tutorial