Customizing CSS

Hi guys,

I’m starting to look at customizing the CSS. I’m following the instructions on this article and have worked my way to #11 but I’m failing somewhere.

https://wpgeodirectory.com/docs/customizing-your-style/

I’m able to find the segment, I’m able to modify and see the change on the website in action but uploading the code to the style page didn’t seem to make any actual change to the site.

Here’s the code I’ve added to the style.css. Can you tell me what I’ve gotten wrong? Thanks.
.geodir_list_heading {background-color:#821717;}