What the Heck is CSS?

CSS stands for Cascading Style Sheets. It is the language used to describe the presentation of a web page — colors, fonts, layout, spacing, animations, and everything visual.

HTML vs CSS

HTML defines the structure and content of a web page (headings, paragraphs, images, links). CSS defines how that content looks. Think of HTML as the skeleton and CSS as the skin, clothes, and makeup.

<!-- HTML provides structure -->
<h1>Hello World</h1>
<p>This is a paragraph.</p>

/* CSS provides style */
h1 {
    color: navy;
    font-size: 2rem;
}
p {
    color: #333;
    line-height: 1.6;
}

Why Do We Need CSS?

• Separation of concerns — keep content (HTML) separate from presentation (CSS)
• Consistency — style an entire website from one stylesheet
• Maintainability — change the look of your site by editing one file
• Responsiveness — make your site look great on phones, tablets, and desktops

Without CSS, every website would look like a plain, unstyled document from the 1990s. CSS is what makes the modern web beautiful.