How to remove a white border around the Logo in Wordpress Theme?

Hi, I have a problem with my custom Logo in a WP Theme.

I tried every border command setting in the .css but there is still a white border around my Logo - this looks really rubbish.

Can you help me: My URL is "i******" (The Logo in the header on the top left site with the white border, this white border should be removed)


EDIT: SOLVED