For using the flags inline with text add the classes `.flag-icon` and `.flag-icon-xx` (where `xx` is the [ISO 3166-1-alpha-2 code](https://www.iso.org/obp/ui/#search/code/) of a country) to an empty `<span>`. If you want to have a squared version flag then add the class `flag-icon-squared` as well. Example:
You could also apply this to any element, but in that case you'll have to use the `flag-icon-background` instead of `flag-icon` and you're set. This will add the correct background with the following CSS properties:
Which means that the flag is just going to appear in the middle of an element, so you will have to set manually the correct size of 4 by 3 ratio or if it's squared add also the `flag-icon-squared` class.
To have only specific countries in the css file, remove the ones that you don't need from the [`flag-icon-list.less`](https://github.com/lipis/flag-icons/blob/master/less/flag-icon-list.less) file and build it again.