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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?
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2.
How do you include CSS in your HTML document?
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3.
Can you explain the difference between class and ID selectors?
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4.
What are pseudo-classes in CSS?
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5.
Describe how to implement a CSS reset and why it is useful.
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Selectors and Combinators

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

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

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

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

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

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

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

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

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

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

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

61.
How do you diagnose and solve layout issues?
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62.
Can you explain how to fix a layout that has unexpectedly broken columns?
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63.
Describe approaches to resolving common browser compatibility issues in CSS.
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64.
How would you determine which styles are applied to an element when multiple styles collide?
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65.
What common CSS problems might cause performance issues?
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CSS 3D Transforms and Visual Effects

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

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

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

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

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

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

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