Fatal error on event signup

Sorry, due to an error, we are unable to fulfill your request at the moment. You may want to contact your administrator or service provider with more details about what action you were performing when this occurred. Message was not parsed due to invalid smarty syntax : Smarty error: [in evaluated template line 9]: syntax error: unrecognized tag: Margin: 0; padding: 0; (Smarty_Compiler.class.php, line 440) Return to home page.

This might be related to fixes done in #6 (closed)

CiviCRM 5.61.3, PW 1.7, Mosaico 2.11.