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100 CSS interview questions

Only coding challenges

Topic progress: 0%

CSS Basics

1.
What does CSS stand for and what is its primary use?
2.
How do you include CSS in your HTML document?
3.
Can you explain the difference between class and ID selectors?
4.
What are pseudo-classes in CSS?
5.
Describe how to implement a CSS reset and why it is useful.

Selectors and Combinators

6.
How do you select elements by attribute in CSS?
7.
What is a pseudo-element, and what are they used for?
8.
Explain the difference between the child combinator and the descendant combinator.
9.
How would you select all direct children elements of a particular type?
10.
What are the universal selector and the sibling combinator, and when would you use them?

Box Model and Layout

11.
What is the CSS Box Model?
12.
Explain margin collapsing.
13.
What are the different values for the box-sizing property and what do they do?
14.
How do you center a block element with CSS?
15.
What is the difference between block, inline, and inline-block elements?

Positioning and Stacking Contexts

16.
Explain the different values for the position property.
17.
Describe z-index and how stacking order is controlled in CSS.
18.
How do you create a sticky footer with CSS?
19.
Can you explain how to create a fixed header that remains at the top on scroll?
20.
When would you use position: sticky?

Styling Text and Fonts

21.
How do you change the font of text in CSS?
22.
What is a web-safe font?
23.
When would you use a font shorthand property?
24.
How can you include and use custom fonts on a webpage?
25.
What is the difference between em and rem units?

Colors, Backgrounds, and Gradients

26.
How do you add a background image to an element?
27.
What is the difference between hex codes, RGB, and named color values?
28.
What are alpha transparency and RGBA?
29.
How do you create a gradient background with CSS?
30.
Explain how to implement multiple backgrounds on a single element.

Flexbox

31.
Describe Flexbox and its advantages.
32.
How does flex-grow work?
33.
Explain the difference between justify-content and align-items.
34.
When would you use align-self?
35.
How do you create equal-width columns using Flexbox?

CSS Grid

36.
What is the CSS Grid layout, and why is it useful?
37.
How do you define grid columns and rows?
38.
What is the difference between grid-template-areas and grid-template-columns?
39.
How do you place items in the CSS Grid layout?
40.
How is overlapping of grid items handled in CSS Grid?

Responsive Design and Media Queries

41.
What is a media query?
42.
How does the viewport meta tag assist with mobile responsive designs?
43.
Describe how to create a mobile-first responsive design.
44.
How can you build a layout that changes from a two-column to a single-column with media queries?
45.
Explain the use of min-width and max-width in media queries.

Transitions and Animations

46.
How do you create a CSS transition?
47.
What is the difference between a CSS transition and animation?
48.
How do you animate an item’s entrance and exit on the page?
49.
Can you explain how to use @keyframes?
50.
How do you set the timing functions in CSS animations?

Advanced CSS Techniques

51.
What is a CSS preprocessor and why would you use one?
52.
Describe the importance of using CSS variables (custom properties).
53.
How do you use CSS modules?
54.
Can you explain the concept of CSS-in-JS?
55.
What tools would you use for CSS linting and formatting?

Styling Forms and User Interfaces

56.
How do you style a submit button to appear as a regular link?
57.
How can you create custom checkboxes and radio buttons with CSS?
58.
Describe how to style a dropdown select box without JavaScript.
59.
What is the best practice for styling placeholder text of an input field?
60.
How do you implement focus styles for accessibility?

Layout Debugging and Troubleshooting

61.
How do you diagnose and solve layout issues?
62.
Can you explain how to fix a layout that has unexpectedly broken columns?
63.
Describe approaches to resolving common browser compatibility issues in CSS.
64.
How would you determine which styles are applied to an element when multiple styles collide?
65.
What common CSS problems might cause performance issues?

CSS 3D Transforms and Visual Effects

66.
How do you utilize 3D transforms in CSS?
67.
Explain how to use the perspective property in CSS.
68.
What is backface visibility?
69.
How do you create a flip card effect using CSS?
70.
What are some examples of visual effects you can achieve with CSS filters?

Layout and Design Principles

71.
What are the principles of responsive web design?
72.
How would you approach designing a grid system with CSS?
73.
Describe the principle of “mobile-first” design.
74.
What are some techniques for maintaining aspect ratios in responsive designs?
75.
How do you ensure your design is accessible and inclusive?

Print Stylesheets and CSS for Print

76.
How do you create a print stylesheet for your web page?
77.
What are the common best practices when creating CSS for print?
78.
Explain the use of page-break in CSS.
79.
How can you test the print version of your web page?
80.
What are some challenges when designing CSS for print?

Pseudo-Elements and Pseudo-Classes

81.
Describe the purpose of the ::before and ::after pseudo-elements.
82.
What is the :hover pseudo-class and how does it work?
83.
Explain the difference between :nth-child and :nth-of-type.
84.
How do :first-child and :last-child work?
85.
What is the :not pseudo-class and when would you use it?

CSS Performance Optimization

86.
How does the complexity of selectors impact performance?
87.
What strategies would you use to optimize the rendering path of CSS?
88.
How do you minimize CSS repaints and reflows?
89.
What are some of the best practices for writing efficient CSS?
90.
How do you optimize CSS for critical rendering path and fast load times?

Scalable and Maintainable CSS

91.
What is Object-Oriented CSS (OOCSS)?
92.
Can you explain the BEM (Block Element Modifier) naming convention?
93.
What are the advantages of using a CSS framework like Bootstrap or TailwindCSS?
94.
How do you ensure CSS scalability and maintainability in a large project?
95.
What are some CSS architecture approaches for large-scale applications?

CSS Special Cases and Practical Scenarios

96.
How would you create a CSS-only hamburger menu toggle?
97.
Explain how to make a pure CSS carousel or slider.
98.
How do you create a masonry layout with CSS?
99.
How would you apply CSS to a web application that should print as well as display on screen?
100.
How do you create a seamless waterfall flow of elements in a responsive design?

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