The five drawers each sized their content Grid to Width=320 inside a panel that itself
animates to 320, with 14px margins — so the content box was 348 wide in a 320 window and its
right edge was clipped. That is why every drawer's content jammed into the right margin
regardless of the margin value.
The Grid now fills the panel (no fixed width) with Margin 14,10,20,12: 14 on the left, 20
between the content and the right edge of the div, which is the requested gutter.