feat: email abstract

src/EmailSender.php

@@ -148,7 +148,7 @@ class EmailSender {
      * @return mixed|string
      */
     private function css_inline( string $content ): string {
-        $styles = $this->renderer->render( 'html/styles', [] );
+        $styles = $this->renderer->render( 'html/email-styles', [] );
         $body   = HTMLDecorator::style_inline( $content, $styles );
     }