White line between containers

Hi, I made a custom template with inky and there is a white line between containers. Is there a way to get rid of them? Those lines are coming in outlook and also in gmail.

Thank you

@kristina_buric Please provide steps to reproduce, actual and expected results, preferably with code samples / repository / screenshots.

when I use multiple containers there is a white line between every container. I tried to delete containers and then everything was fine.