Why is this not correct?

You need to place that exact style you wrote in the css tab. You are placing it directly in the html which will not work.

You would be able to do it the way you are if you wrapped it in a <style> tag and placed it in the head, but it is much preferred to do it in a separate css file.

It looks like you've intermixed the HTML and CSS.

Your CSS is correct, just remove those 3 lines from the index.html file and add them to the styles.css file (which is empty initially).

Remember that the HTML file is associated with content, and will be composed of elements identified by tags such as these:

<p>Here is a paragraph</p>
<div>
  <ul>
    <li>This is an item in an unordered list</li>
  </ul>
</div>

The CSS file is associated with presentation and will be composed of selectors and groups of property names and values, such as these:

h1 {
    color: purple;
}
div {
    margin: 20px;
}

You had all the right stuff, you just need to get used to putting it in the right place.

The challenge you are working on has two tabs at the top the of the challenge window. One for the HTML (index.html) and one for the CSS (styles.css).

For the challenge, you will need to click on the CSS tab and enter your code into there. So, just reset the challenge and put exactly what you had written into the HTML file into the CSS file, and you will be good to go.

And... reviewing is always a good thing. I am constantly reviewing materials. :)

Keep Coding!

ok guess I need to review again, because I do not understand.