margin attribute defines the space around an HTML element. Negative values can be used to overlap content. It specifies a shorthand property for setting margin properties in a declaration.
You can try running the following code to set the margins -
<html>
<head>
</head>
<body>
<p style = "margin: 20px; border:2px solid yellow;">
All four margins will be 20px
</p>
<p style = "margin: 15px 4% -10px; border:2px solid red;">
Top margin will be 15px, left and right margin will be 4% of the total width of the document, bottom margin will be -10px
</p>
</body>
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