dhtmlxlayout border and rounded corner

How can i drop the border?

And how can i make rounded corner?

Thank you

Could you please provided completed high-quality screenshot of your point of view on this?
Probably we can suggest you the best way (code customization is necessary).

Thank you for your answer,

but i found the way to drop the corner and i don’t need anymore to make rounded corner.

But sometimes i have an error :

uncaught exception: An invalid or illegal string was specified (NS_ERROR_DOM_SYNTAX_ERR)
context.translate(0,db); context…cxs),1-(scys)); context.rotate(-0.05);


Oh excuse me.

This error doesn’t concern you.
Thank you