I will explain you how to optimize few files because it’s dangerous to make changes live. Here are few tips:
Copy all CSS from Elvyre options -> Appearance -> Custom CSS and paste it into separate CSS file. Load that file in “pi_theme_styles” function using “wp_enqueue_style”. Don’t forget to remove all code from Custom CSS field. Now “custom-styles.php” file won’t be loaded (if it still does, you can comment hook in functions.php, line 140).
Open “elvyre / css / darkblue.css” and replace color “#727c89” with your color style (as I can see it’s #f97745). Remove custom color value in Elvyre options -> Appearance -> Custom Color Style.
This two tricks will disable loading “custom-styles.php” and “color-style.php”.
After you do this, CSS for slide caption and like-buttons will work too because for some reason on your website custom styles are not properly loading.