Custom HTML margins

I have Custom HTML modules with the Title of the module position set to Show.
The Custom HTML is just an image but it looks smaller than the actual size and has space around it.
How can i get a 0 margin and the actual size of the image?
Thanks!

It would help us if you can post a website link so we can see which element is adding margins so we can make a suggestion.

See you around...

I am working on MAMP so i do not have a URL.
Below is a screenshot of the Custom HTML module containing an image.
I am using Music Free template.
I need to see the title of the module with the full sized 300x250 image (no white behind it).
Thanks!

customhtml.png

Can you please add " clear" suffix with empty space in front, enter it in module settings > Advanced options > Module Class Suffix.

See you around...