Styling visual editor – not working

I’m not having any luck with styling the content of the TinyMCE field – it’s being used in a PMPro form on the front end (Update Profile page).

I’ve registered a specific editor stylesheet (separate from my Gutenberg editor one):

add_editor_style( 'custom-editor-style.css' );
as part of the after_setup_theme action.

and set very specific CSS rules in the stylesheet:

body#tinymce.mce-content-body._pods_dfv_pods_meta_member_bio.wp-editor {
 	font-family: "Open Sans", "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; 
	line-height: 1.5;	
	font-size: 18px;
}
body#tinymce.mce-content-body._pods_dfv_pods_meta_member_bio.wp-editor p {
	font-size: 18px; 
	margin-top: 0;
	margin-bottom: 1.5em;
}

but it’s unaffected. Still ugly, small, Verdana 14px. Any suggestions?

Thank you!