Adjust the Color of Various Elements to Complementary Colors , I change the button background color as given in task but its not work how its?

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**

<style>
body {
  background-color: white;
}
header {
  background-color: #09A7A1;
  color: white;
  padding: 0.25em;
}
h2 {
  color: #09A7A1;
}
button {
  background-color: #FF790F;
}
footer {
  background-color: #09A7A1;
  color: white;
  padding: 0.5em;
}
</style>
<header>
<h1>Cooking with FCC!</h1>
</header>
<main>
<article>
  <h2>Machine Learning in the Kitchen</h2>
  <p>Join this two day workshop that walks through how to implement cutting-edge snack-getting algorithms with a command line interface. Coding usually involves writing exact instructions, but sometimes you need your computer to execute flexible commands, like <code>fetch Pringles</code>.</p>
  <button>Sign Up</button>
</article>
<article>
  <h2>Bisection Vegetable Chopping</h2>
  <p>This week-long retreat will level-up your coding ninja skills to actual ninja skills. No longer is the humble bisection search limited to sorted arrays or coding interview questions, applying its concepts in the kitchen will have you chopping carrots in O(log n) time before you know it.</p>
  <button>Sign Up</button>
</article>
</main>
<br>
<footer>&copy; 2018 FCC Kitchen</footer>
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36

Challenge: Adjust the Color of Various Elements to Complementary Colors

Link to the challenge:

If you look carefully, there is a typo with the hexcode of orange colour.

  • The challenge asks you to use the hexcode of #FF790E for orange colour.

Happy fixing!