Neste all html element in ur container-fluid

Tell us what’s happening:

Your code so far

<style>
  .red-text {
    color:#FF0000;
  }
  .green-text {
    color:#00FF00;
  }
  .dodger-blue-text {
    color:#2998E4;
  }
  .orange-text {
    color:#FFA500;
  }
</style>

<h1 class="red-text">I am red!</h1>

<h1 class="green-text">I am green!</h1>

<h1 class="dodger-blue-text">I am dodger blue!</h1>

<h1 class="orange-text">I am orange!</h1>

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/use-hex-code-to-mix-colors

Not sure what your question is. Your topic title seems to be from another challenge. Can you explain in detail what you do not understand and which challenge you need help with?