giulia72
Hi
If you have custom work in custom.css file It will not be override in template updates.
If you have custom work in /html folder or /local folder or any other file except /local folder
It will be override in updates.
You can put your override in /local folder to avoid overrides.
Example :
Original file : /templates/yourJA Template/tpls/blocks/default.php
Override file : /templates/yourJA Template/local/tpls/blocks/default.php
Regards