In the synth canvas trial for website admins, each drawn screen in the hero's stack of cards keeps its normal thin frame. The dark 7 pixel display bezel added earlier is removed, since it stood out from the thin edges everywhere else on the page. Nothing changes for anyone else.
Front page synthesizer trial: no bezel round the hero screens
In the admin-only ?try=synth front page, the dark bezel round each drawn screen in the hero's stack is removed.