Edit file File name : layout.html.twig Content :<!DOCTYPE html> {% set fallback = app.request is not null ? app.request.locale : 'en' %} {% set language = model.template.language|default(fallback) %} <html lang="{{ language }}"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport"> <title>{% block title %}{{ model.invoiceNumber }}-{{ model.customer.company|default(model.customer.name)|u.snake }}{% endblock %}</title> <style type="text/css"> {{ encore_entry_css_source('invoice')|raw }} </style> </head> <body class="invoice_print"> <div class="wrapper"> <section class="invoice"> {% block invoice %}{% endblock %} </section> </div> </body> </html> Save