• Hi.
    In order to load the CSS file only when the widget is used, please change the function ESR_Official_Widget_for_wordpress_custom_Styling() into:

    function ESR_Official_Widget_for_wordpress_custom_Styling(){
    	if ( is_active_widget( false, false, 'ersradio-widget', true ) ) {
        // Register my custom stylesheet
        wp_register_style('volumeSliderStyling', plugins_url('ersradio-widget/widgetStyling.css'));
        // Load my custom stylesheet
        wp_enqueue_style('volumeSliderStyling');
    	}
    }
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