Practice how to set margin to an HTML element using CSS

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Set margin of an HTML element using CSS</title>
    
    <style>
        /* CSS id name used to apply css style to the divs*/
        #div-1 {
            margin: 30px; /*30px margin at all sides of the div*/
            background-color: lightpink; /*background color of the div*/
        }
        #div-2 {
            margin: 20px; /*20px margin at all sides of the div*/
            background-color: lightblue; /*background color of the div*/
        }

        #div-3 {
            margin: 10px; /*10px margin at all sides of the div*/
            background-color: lightgreen; /*background color of the div*/
        }
        #div-4 {
            
            background-color: green; /*background color of the div*/
        }
        #p-1 {
            margin: 40px; /*30px margin at all sides of the paragraph*/
            position:absolute;
        }
        div{
            min-height: 100px;
        }
    </style>
</head>
<body>

    <h1>How to set margin of an HTML element using CSS?</h1>
    <div id="div-1">First div with 30px margin at all sides</div>
    <div id="div-2">Second div with 20px margin at all sides</div>
    <div id="div-3">Third div with 10px margin at all sides</div>
    <div id="div-4">
        <p id="p-1">Paragraph with 40px margin at all sides with absolute position.</p>
    </div>


</body>
</html>