By following the steps given below, you can use Flaticon with CSS.
First, you have to prepare your collection by adding mono-color icons to your website's collection.
Then you have to download the icon font by clicking on "Download collection."
The third step is to copy the source files and CSS to your web folder.
After this, you must load the stylesheet by requesting from the head of your web.
Using this:
The final step is to use the classes of each Icon. As a result, they will appear on your website.
Using this: or