Allow out-of-bounds elts to attach to palette.
Allow out-of-bounds elts to attach to palette.

This puts overflow:visible on the palette wrapper div, to allow
embedders to attach elements that decorate the palette that may
extend outside its bounds.

dweintrop/droplet,droplet-editor/droplet,droplet-editor/droplet,dweintrop/droplet,sakagg/droplet,PencilCode/droplet,joshlory/droplet,PencilCode/droplet,sakagg/droplet,joshlory/droplet