Help would be greatly appreciated

.red-text { color: red; }

CatPhotoApp

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

i dont know what im doing wrong but every time i try to mess with the h1 it doesnt work

<h1 class="red-text"> Some text </h1> for example