The ultimate guide to CSS interviews, developed by FAANG engineers. Prep faster and get interview-ready in hours with battle-tested, real-world questions and a structured approach to styling and advanced concepts.

In front-end interviews there’s a lot to cover. You have to study up on JavaScript, HTML, and then there’s CSS, and that’s the focus of this course.

This course compiles a comprehensive range of questions that you are most likely to be tested on during front-end interviews. This is an intermediate course with more than 250 coding challenges and multiple choice questions, so there’s plenty of opportunities to get your hands dirty.

You will start by going through several self-assessment exams to get an idea of what you’ll need to study up on. From there, you’ll go into interview questions on styling such as text, colors, backgrounds, and display.

In the latter half of the course, you’ll focus on advanced concepts like Flexbox, block formatting, and working with SVG. In all, this course serves as a stand-alone guide for those who are starting to prepare for front-end interviews.

By the end of this course, you will have gained the confidence to go in and answer any question.

CSS for Front-end Interviews

# Challenge

You will need to add **CSS** to show the following output:



* {
  margin:0;
}

.box {
  width: 100px;
  height: 100px; 
  position: fixed;
}

#box1 { 
  animation: box1; 
  animation-duration: 8s;
  animation-iteration-count: infinite;
  background: coral;
  top: 0;
  left: 0;
}

#box2 {
  animation: box2;
  animation-duration: 8s;
  animation-iteration-count: infinite;
  background: steelblue;
  top: 100px;
  left: 100px;
  border-radius: 50%;
}

@keyframes box1 {  
  25% {
    background: red;
    top: 0;
    left: 80vw;
    border-radius: 50% 0 0 0;
  }
  
  50% {
    background: blue;
    top: 400px;
    left: 80vw;
    border-radius: 50% 50% 0 0;
  }
  
  75% {
    background: green;
    top: 400px;
    left: 0;
    border-radius: 50% 50% 50% 0;
  }
  100% {
    top: 0;
    left: 0;
    border-radius: 50% 50% 50% 50%;
  }
}

@keyframes box2 {  
  25% {
    background: green;
    top: 300px;
    left: 100px;
    border-radius: 50% 50% 50% 0;
  }
  
  50% {
    background: blue;
    top: 300px;
    left: 70vw;
    border-radius: 50% 50% 0 0;
  }
  
   75% {
    background: red;
    top: 100px;
    left: 70vw;
    border-radius: 50% 0 0 0;
  }
 
  100% {
    top: 100px;
    left: 100px;
    border-radius: 0 0 0 0;
  }  
}



// Async Tests Example
/*
window.onModulesLoaded = new Promise( function( resolve, reject ) {
  setTimeout(function() {
    pTag = document.querySelector("div");
    pTag.innerHTML = '';
    newVal = document.createElement("p");
    newVal.innerHTML = 'Hello World';
    pTag.appendChild(newVal);
    resolve();
  }, 100)
});
*/

codemirror

The `height` and `width` of the two boxes are `100px`. The color used in the challenge are: 

- *steelblue*  
- *coral* 
- *red* 
- *green*
- *blue* 

The starting position of the outer box is set to `0` for both `top` and `left`. The starting position of the inner box is set to `100px` for both `top` and `left`. The outer box is shifted to the left by `80vw` and to the bottom by `400px`. The inner box is moved to the right by `70vw`  and to the bottom by `300px`. The animation will run infinitely, and one iteration is completed in eight seconds. The height of the output window is `500` pixels.

Evaluate yourself by creating an animation in this challenge.

Introduction

Basic Styling

Intermediate Styling

Advance Styling

Advance Concepts

Responsive Design

Wrapping Up

CSS Transform Challenge 1

Challenge