What is CSS?

In the previous article, we learned that HTML is used to create the structure of a webpage.

However, a webpage built using only HTML looks very plain.

It has headings, paragraphs, buttons, and images, but everything appears in the browser's default style.

This is where CSS comes in.

CSS is the technology that makes webpages visually attractive.

It controls how HTML elements look on the screen.

What Does CSS Stand For?

CSS stands for Cascading Style Sheets.

It is the standard language used to style webpages.

While HTML defines what appears on the page, CSS defines how it should appear.

For example, CSS can control:

• Colors
• Fonts
• Text size
• Backgrounds
• Spacing
• Borders
• Layout
• Animations
• Shadows
• Responsive design

Without CSS, modern websites would look very plain and difficult to use.

Why Do We Need CSS?

Imagine building a house.

HTML creates the walls, doors, windows, and rooms.

But the house still has no paint, furniture, decorations, or design.

CSS is like the interior and exterior design of the house.

It adds the visual appearance that makes the house attractive and comfortable.

The same idea applies to webpages.

HTML provides the structure.

CSS controls the presentation.

Together, they create webpages that are both functional and visually appealing.

What Can CSS Do?

CSS is much more than changing colors.

It can be used to:

• Style text
• Change fonts
• Adjust spacing
• Position elements
• Create layouts
• Build navigation bars
• Design buttons
• Create cards
• Add gradients
• Add shadows
• Create transitions
• Build animations
• Make websites responsive

Almost every visual aspect of a webpage is controlled using CSS.

Responsive Design

People use websites on many different devices, including:

• Mobile phones
• Tablets
• Laptops
• Desktop computers

A webpage that looks good on a desktop may not look good on a mobile phone.

CSS allows developers to create responsive websites that automatically adjust their layout based on the screen size.

Responsive design has become an essential part of modern web development because users expect websites to work well on every device.

Can a Website Exist Without CSS?

Yes.

A website can function without CSS because HTML already provides the structure.

However, it would look very basic and would not provide a good user experience.

This is why almost every website on the internet uses CSS.

How Does CSS Work with HTML and JavaScript?

The three core frontend technologies each have a specific role.

HTML creates the structure.

CSS controls the appearance.

JavaScript adds interactivity and behavior.

Together, they form the foundation of modern frontend development.

Modern CSS

CSS has evolved significantly over the years.

Today, developers can build complex layouts and modern user interfaces using features such as:

• Flexbox
• Grid
• Variables
• Animations
• Transitions
• Media Queries

These features make it possible to create responsive and visually rich websites without relying heavily on additional tools.

CSS Frameworks

As websites became larger, developers started creating reusable collections of CSS styles to speed up development.

These collections are called CSS frameworks.

A CSS framework provides pre-designed components and utility classes that help developers build websites more quickly.

Some popular CSS frameworks include:

• Bootstrap
• Tailwind CSS
• Bulma
• Foundation

These frameworks are optional.

Every frontend developer should first understand core CSS before using any framework.

Is CSS Still Used Today?

Absolutely.

Every modern website uses CSS in one form or another.

Whether you're building:

• A portfolio website
• A company website
• An online store
• A social media platform
• A streaming service
• A web application

CSS is responsible for making the interface attractive, organized, and responsive.

Even frontend frameworks like React, Angular, Vue, and Next.js still rely on CSS for styling.

Summary

CSS, or Cascading Style Sheets, is the standard language used to control the appearance of webpages.

It styles HTML elements by adding colors, fonts, layouts, spacing, animations, and responsive designs.

While HTML provides the structure of a webpage, CSS transforms that structure into a visually appealing user interface.

Together with HTML and JavaScript, CSS forms one of the three fundamental technologies of frontend development.

Learn more:

This article introduces the basics of CSS. If you'd like to learn CSS in depth—from selectors and properties to Flexbox, Grid, animations, responsive design, and modern layout techniques—explore our complete CSS tutorial series.