IF you want the CSS to be in your plugin’s settings page, you should be using this action: admin_enqueue_scripts, as the action you are currently using is for the front end. add_action( ‘admin_enqueue_scripts’, array($this, ‘register_plugin_styles’ ));
How do I view registered syles and scripts for enqueue
Additional CSS – crashing with javascript-html minifier?
Custom style sheet won’t enqueue / load if the css file actually exists. [closed]
wp_enqueue_style not working if the file is in a sub folder
Well one option you could do, is wrap them in style tag and stuff them into the header via a filter. It’s dirty, but it would work. I’d honestly do that, over forcing inline styling on elements, because they won’t get cached. Plus anyone who wants to do their own styling to override those elements … Read more
You need login_enqueue_scripts for the login page. See: https://codex.wordpress.org/Plugin_API/Action_Reference/login_enqueue_scripts Swap that out in your add_action, or add a new one, and it should work.
Depends on the source. If they are locally hosted, then they should be in the CSS files using @font-face. If they come from a service like Adobe Type Kit or Google Fonts, then they have to be enqueued in the functions.php to go into the wp_head() function. Edit: I forgot to mention that there are … Read more
Use wp_enqueue_style() in your functions.php: function custom_wp_enqueue_style() { wp_enqueue_style( ‘bootstrapcdn’, “https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css” ); } add_action ( ‘wp_enqueue_scripts’, ‘custom_wp_enqueue_style’ ); The second parameter can be the path to the folder in your server where you have your bootstrap.
RTL stylesheet is not loaded with wp_enqueue_style() so it wouldn’t appear in global $wp_styles variable. WordPress loads it with get_locale_stylesheet() function. You can remove loading locale scripts completely: function abort_loading_rtl_stylesheet() { remove_action( ‘wp_head’, ‘locale_stylesheet’ ); } add_action( ‘init’, ‘abort_loading_rtl_stylesheet’ ); or filter its output to load your custom rtl stylesheet: function override_default_rtl_styles(){ return ‘path/to/custom/rtl.css’; } … Read more