Mine is also not showing although it's only been a half an hour since I uploaded it to my server in my root folder. Do I need this HTML code in the page_container?
Using a favicon
After generating a favicon with this tool download and save to the root directory of your site. Then include the following code in the head of your HTML document.
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon">
<link rel="icon" href="/favicon.ico" type="image/x-icon">