Are you a fresher preparing for a web development interview? CSS plays a vital role in front-end development, and having strong CSS fundamentals can make a great first impression. In this guide, we’ll walk you through the top 25 CSS interview questions and answers that will help you ace your next job interview.
Why Learn CSS as a Fresher?
CSS (Cascading Style Sheets) is essential for designing visually appealing web pages. From styling layouts to controlling responsiveness, CSS gives life to HTML content.
Top 25 CSS Interview Questions and Answers
1. What is CSS?
- CSS stands for Cascading Style Sheets. It is used to style HTML documents by controlling layout, color, fonts, and overall visual presentation.
2. What are the types of CSS?
Inline CSS
Internal CSS
External CSS
3. What is the difference between id and class in CSS?
idis unique and used for a single element.classcan be reused on multiple elements.
#header {
background-color: blue;
}
.menu {
color: red;
}
4. What is the Box Model in CSS?
- The CSS Box Model consists of:
Content
Padding
Border
Margin
It helps in spacing and layout.
5. How do you apply CSS to HTML?
Inline (
<p style="color: red">)Internal (
<style>inside<head>)External (
<link rel="stylesheet" href="style.css">)
6. What is specificity in CSS?
- Specificity determines which CSS rule is applied when multiple rules match the same element.
7. What is the difference between relative, absolute, fixed, and sticky positioning in CSS?
relative: relative to its normal positionabsolute: relative to the nearest positioned ancestorfixed: relative to the viewportsticky: toggles between relative and fixed
8. What are pseudo-classes in CSS?
- Pseudo-classes define a special state of an element, like:
a:hover {
color: green;
}
9. What are pseudo-elements in CSS?
- They style specific parts of elements. Example:
p::first-letter {
font-size: 200%;
}
10. How do you center a div using CSS?
- Example 1: Flexbox
.parent {
display: flex;
justify-content: center;
align-items: center;
}
Example 2: Margin auto
div {
width: 200px;
margin: 0 auto;
}
10 Real-Life CSS Examples for Interviews
Create a responsive navigation bar using Flexbox
Use media queries to make text responsive
Implement a hover animation for buttons
Design a card UI layout
Build a CSS grid-based image gallery
Use
z-indexto layer elementsApply a sticky header using
position: stickyCreate a tooltip using
::afterImplement a dark/light theme toggle with classes
Use transitions for smooth hover effects
15 More CSS Interview Questions
11. What is z-index in CSS?
- Controls the stack order of overlapping elements.
12. What are media queries?
- Used to apply styles based on device screen size.
13. What is Flexbox?
- A CSS layout model that arranges elements in a flexible way in one dimension.
14. What is Grid in CSS?
- A layout system for two-dimensional design (rows and columns).
15. What is the difference between em, rem, and px?
pxis fixed.emis relative to the parent.remis relative to the root.
16. What is opacity in CSS?
- Controls transparency (0 = fully transparent, 1 = opaque).
17. How do you make a website mobile responsive using CSS?
- Using media queries and fluid layouts.
18. What is a CSS Preprocessor?
- A tool like SASS or LESS that extends CSS with variables, mixins, etc.
19. What is !important in CSS?
- Overrides all other declarations.
20. How do transitions work in CSS?
Enable animation from one state to another smoothly.
button {
transition: background-color 0.3s ease;
}
21. How to hide an element in CSS?
- Use
display: noneorvisibility: hidden.
22. What is the difference between inline, block, and inline-block?
| Property | inline | block | inline-block |
|---|---|---|---|
| Layout | Flows with text (inline flow) | Starts on a new line (block flow) | Flows with text but behaves like a block |
| Width/Height | Cannot set width or height | Can set width and height | Can set width and height |
| Line Break | Does not cause line break | Causes a line break before & after | Does not cause line break |
| Common Usage | <span>, <a>, <strong> | <div>, <p>, <h1> | Buttons, menus, custom UI blocks |
23. How to add custom fonts in CSS?
@font-face {
font-family: 'MyFont';
src: url('myfont.woff2') format('woff2');
}
24. What is the default position of HTML elements?
- Static.
25. How can you create animations in CSS?
@keyframes slide {
from { left: 0; }
to { left: 100px; }
}
div {
animation: slide 1s linear;
}
FAQs: CSS Interview Questions
Q1. How much CSS should a fresher know for an interview?
- Basic to intermediate topics like selectors, box model, Flexbox, and responsiveness.
Q2. What is the best way to practice CSS?
- Build mini projects like buttons, forms, layouts, and use platforms like CodePen or JSFiddle.
Q3. Do I need to know Flexbox and Grid?
- Yes. Modern layout systems are frequently asked in interviews.
Q4. Are animations in CSS important?
- Yes, basic understanding is enough. Know transitions,
@keyframes, andtransform.
Q5. Can I use CSS without HTML?
- No, CSS needs HTML to style. However, tools like JS frameworks might integrate styles differently.
Conclusion
Mastering these CSS interview questions will not only boost your confidence but also set you apart as a smart and prepared candidate. Practice these answers, build small CSS projects, and stay updated with the latest features in CSS.
👉 Start preparing today and succeed with confidence!
