php - Why Custom CSS file doesn't work anymore?

Solution:

no need to use "/" for path to CSS, so you can write like this

<link rel="stylesheet" href="includes/templates/index.css"/>

Answer

Solution:

The problem can comes from PHP error when he tries to execute the function getTitle() he found a problem so that the navigator will not read the next lines after <title> tag. So that, try to remove it from the title tag <title></title> to make sure that the problem is not that.

Source