add_editor_style()

Introduction#

The function allows user to load stylesheets for the TinyMCE editor

Parameter	Details
$ stylesheet	(array or string) (Optional) Stylesheet name or array thereof, relative to theme root. Defaults to ‘editor-style.css’
## Loading a single css file
Code

function add_new_style() {
    add_editor_style( 'file-name-here.css' );
}
add_action( 'admin_init', 'add_new_style' );

Explanation

In the above code, we used add_editor_style to load the css file. We also used add_action to make sure that WordPress runs our function.