Adding closing x button.

[bomshteyn]

My client has asked me to add a closing x button to the top corner. Like in the attached screenshot.

I have achieved it by overriding the support-bubble.blade.php & script.blade.php. If others are interested in having this as well i can create a PR.

[colinmackinlay]

Interested to see this. I would also suggest modifying it so that clicking away from the form also closes it instead of only being able to close by clicking the bubble again