Is there a way to create the effect of a container inside a container in a template?

Hi,

Is there a way to create the effect of a container inside a container in a template?

I have several modules that I need to group together, but I need to add a background colour behind all of those modules.

Example:

I have 3 separate modules; module 1, module 2 & module 3. They all have red backgrounds. I need to wrap those 3 red modules inside another table and that outer table needs to have a red background too. I want to eliminate the chance of a white line appearing between those 3 different modules. If all 3 modules are wrapped in same container with a red background colour - if the line does appear, you won't see it, because the background is red. I've read that you can't have 2 containers - but is there another way to achieve this?

Any help would be appreciated.

Thanks