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<!DOCTYPE html>
<html lang="en">
<head>
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-D0ENCWPZL9"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-D0ENCWPZL9');
</script>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>3. CSS Box Model</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body, html {
height: 100%;
font-family: 'Poppins', sans-serif;
overflow-x: hidden;
background-color: #1cc9be;
}
.section {
background-color: rgba(255, 255, 255, 0.3);
margin: 20px auto;
padding: 20px;
border-radius: 12px;
width: 90%;
max-width: 1000px;
box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}
h2, h3 {
color: #333;
margin-bottom: 15px;
}
p {
font-size: 18px;
margin-bottom: 20px;
line-height: 1.7;
}
textarea {
width: 100%;
height: 150px;
font-family: monospace;
font-size: 16px;
padding: 10px;
border: 2px solid white;
border-radius: 8px;
margin-top: 10px;
margin-bottom: 10px;
background: rgba(255,248,240,0.4);
}
button {
background-color: #28a745;
color: white;
border: none;
padding: 10px 20px;
font-size: 16px;
border-radius: 8px;
cursor: pointer;
margin-bottom: 20px;
}
iframe {
width: 100%;
height: 150px;
background: rgba(255,248,240,0.4);
border: 2px solid white;
border-radius: 8px;
margin-top: 15px;
}
</style>
</head>
<body>
<div class="section">
<h2>3. CSS Box Model</h2>
<h3>1. Box Model Overview</h3>
<p><strong>Explanation:</strong> CSS Box Model ek element ke 4 main parts dikhata hai:
<ul>
<li><strong>Content:</strong> Actual text ya image</li>
<li><strong>Padding:</strong> Content ke around space</li>
<li><strong>Border:</strong> Padding ke baahar line</li>
<li><strong>Margin:</strong> Border ke baahar ki space</li>
</ul>
</p>
<textarea id="box1">
<!DOCTYPE html>
<html>
<head>
<style>
.box {
background-color: lightblue;
padding: 20px;
border: 5px solid blue;
margin: 30px;
}
</style>
</head>
<body>
<div class="box">Box Model Example</div>
</body>
</html>
</textarea>
<button onclick="runCode('box1', 'outbox1')">Run Code</button>
<iframe id="outbox1"></iframe>
<h3>2. Box Sizing</h3>
<p><strong>Explanation:</strong> By default, width sirf content ke liye hoti hai. Agar aap <code>box-sizing: border-box</code> lagao, to padding + border bhi width me include ho jaata hai.</p>
<textarea id="box2">
<!DOCTYPE html>
<html>
<head>
<style>
.box1, .box2 {
width: 300px;
padding: 20px;
border: 5px solid black;
margin: 10px;
}
.box1 {
box-sizing: content-box;
background-color: lightcoral;
}
.box2 {
box-sizing: border-box;
background-color: lightgreen;
}
</style>
</head>
<body>
<div class="box1">Content-box (default)</div>
<div class="box2">Border-box</div>
</body>
</html>
</textarea>
<button onclick="runCode('box2', 'outbox2')">Run Code</button>
<iframe id="outbox2"></iframe>
<h3>3. Overflow Property</h3>
<p><strong>Explanation:</strong> Jab content box ke andar fit nahi hota, tab <code>overflow</code> property usse control karti hai. Values ho sakti hain: <code>visible</code>, <code>hidden</code>, <code>scroll</code>, <code>auto</code>.</p>
<textarea id="box3">
<!DOCTYPE html>
<html>
<head>
<style>
.container {
width: 200px;
height: 100px;
border: 2px solid black;
overflow: scroll;
background-color: #fef4c4;
}
</style>
</head>
<body>
<div class="container">
This is a long content that will overflow from the box. Scroll to see full content inside the box.
</div>
</body>
</html>
</textarea>
<button onclick="runCode('box3', 'outbox3')">Run Code</button>
<iframe id="outbox3"></iframe>
</div>
<script>
function runCode(textareaId, iframeId) {
const code = document.getElementById(textareaId).value;
const iframe = document.getElementById(iframeId);
iframe.contentDocument.open();
iframe.contentDocument.write(code);
iframe.contentDocument.close();
}
</script>
</body>
</html>