Just came across this working on a prototype...
basically all you need to do to remove this:
is use the custom css import plugin, and import a css file withe the following code:
[b]if you dont already have the css import plugin installed, go here: [quote:1uby4m7y]https://www.scirra.com/forum/viewtopic.php?t=78007&start=0
Those arrows are part of the Shadow DOM, which are basically DOM elements on your page which are hidden from you. [i](stackoverflow..)[/i]