What is CSS?
CSS stands for Cascading Style Sheets. It is a stylesheet language used to style and format HTML documents. While HTML gives your page structure, CSS is what brings it to life—defining how elements look, behave visually, and respond on different devices.🔍 Why is CSS Important?
Without CSS, all websites would appear as plain black text on a white background. CSS allows developers to:
✅ Style text: Change fonts, colors, spacing, and decoration
✅ Control layout: Position elements using flexbox, grid, float, etc.
✅ Make pages responsive: Adjust content for mobile, tablet, and desktop screens
✅ Reuse styles: Apply a single stylesheet across multiple pages for consistency
🧱 HTML Without CSS
<!DOCTYPE html>
<html>
<head>
<title>No CSS</title>
</head>
<body>
<h1>Hello, World!</h1>
<p>This is a paragraph.</p>
</body>
</html>
Output Behavior:
. Plain black text
. Default browser font and margins
. No visual styling or layout control
🎨 HTML With CSS:
<!DOCTYPE html>
<html>
<head>
<title>Styled Page</title>
<style>
body {
background-color: #f4f4f4;
font-family: Arial, sans-serif;
}
h1 {
color: #0077cc;
}
p {
color: #333;
font-size: 18px;
}
</style>
</head>
<body>
<h1>Hello, World!</h1>
<p>This is a styled paragraph.</p>
</body>
</html>
🖼️ Output Behavior:
. Light gray background
. Blue heading with a custom font
. Paragraph styled with dark gray text and increased font size
💡 Did You Know?
The term “Cascading” in CSS means that styles can override one another. For example, a more specific rule or a later rule can take precedence over a general or earlier one. This is known as the cascade and is a powerful feature of CSS.