Problem: When dragged itme, height is 70% shrink.
Cause: Bootstrap css and jquery-sortable.js is conflict.
Solution: item height * 1.5 in jquery-sortable.js , it is duty hack I know.
change pallet name and so on.
unvisible items bullet.
add jquery--ui for accordion and drag & drop.
add accordion for code pallet.
change style.
exchange jquery-ui.js without drag and drop.
fixed side pallete