HabPanel - Custom widget that consumes the entire panel

So, I’ve been playing around with the template widget - not bad actually. But is there any possibility to consume the entire panel, no border, no padding, no nothing? Width: 100% at least keeps a border, Height: 100% doesn’t work at all - even though I’m not an HTML/CSS expert it actually should, assuming that parting the entire screen into an evenly sized grid makes it necessary to have a width/height management up to root document. Even with fixed pixel, an offset remains from the upper-left corner of the panel.

Wanted to spice it up with a picture but no glue how upload one…

You all have a great weekend,