CSS Interview questions

⭐

• What will these lines do ?

  .header {
  color: 'red';
  }
  
  #header {
  color: 'yellow';
  }
  
  .header > h1 {
  color: 'blue';
  }
  
  input.header {
  color: 'brick';
  }
  
  div.header {
  color: 'brown';
  }

• <div class="header"> Hello, world! </div>

• Name 2 CSS styling frameworks

⭐⭐

• How would you build a responsive interface ?
• What is the difference margin vs padding ?
• What are CSS preprocessors ?