Use a CSS Class to Style an Element help

I dont know what im doing wrong, just dont change the color:

  .red-text {
    Color: red;

<h2 class= "red-text">CatPhotoApp</h2>

<p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>

I cleaned up your code. Code snippets should be contained in triple backticks. Look here for more information.

Color should not be capitalized.

Thank you, finally i can find my mistake, thanks for answer so fast