Custom module

Hello;
I am trying to create a custom module with border.
I am using this code:

.special{
  background: #fff;
  border: 1px solid #ccc;
  border-radius:5px;
}

But the result is displaying with 2 borders. How to preceed to display only one?

Please, find the attachment.

Best regards and thank you

Hello,

I guess you set the module class suffix to "special" in the module parameters and added this CSS code in custom.css. When I do the same, there's only one border. Please provide the link to your site so I can inspect the code and see what's wrong.

Thanks,
Milos