Hide section border in dynamics 365 crm form

Hi,

I am currently using dynamics 365 crm online. I placed a webresource (html button) with in a section of a tab. Everything works fine.But, I am unable to hide/remove the section border(thin dark border ,which can be seen for all sections on the form) that comes around the webresource (html button).I even tried adjusting the size of the html button for fitting exactly into the section border.But, that's also not happening. Can some one please suggest me? The border around the button looks so odd as in the attached image.