Can't remove chart border

Hi

I am having an issue when export charts as both Script and iFrame. Whenever I embed them on our website they appear with a border, even though I have not customised the chart with a border.

Hi,

I have just tried both the inject and iframe version of this chart in an isolated environment and was unable to recreate the issue: https://jsfiddle.net/kncxhy41/

Is there maybe some global styling being applied on your website around these elements?