Select a Text for CSS

Start by creating a stylesheet for your plugin.Then you can use the do_action('admin_enqueue_scripts') to enqueue it in the controlpanel only, avoiding it to be loaded in the frontend.

You could do something like this:

function my_plugin_admin_styles() {
    wp_enqueue_style('my-plugin-admin-style', plugin_dir_url(__FILE__) . 'assets/css/admin-style.css', array(), '1.0.0', 'all');
}
add_action('admin_enqueue_scripts', 'my_plugin_admin_styles');

Just make sure to correct the path for your stylesheet. In the code above, it’s assumed the stylesheet is in an “assets” folder – and in a “css” folder within the assets-folder. Also, I would highly recommend to rename the function name – and the style ID “my-plugin-admin-style” to something more fitting for your plugin.

Then you can add the classes to your optionspage, and style them in the stylesheet without messing anything else up – as long as the classes are unique.