Using CM Tooltip for Images Only

Thank you for a great plug-in.

When used with an “image only” where I only want the image to display…. how do you remove the grey border completely from the popup.

I’ve managed to get most of the border removed but I can’t get the “horizontal grey line” at the top removed? See example here: https://static.bjrnet.com/temp/GreyLineExample.jpg

The page I need help with: [log in to see the link]