Transition #1 (duration hover == duration unhover)
Transition #2 (duration hover * 2 == duration unhover)
Transition #3 (duration hover != duration unhover, different duration border-width with delay)
Transform + Transition #1
Overflow #1 (overflow-x: visible; not working)
Overflow #2 (overflow-y: visible; not working)
Overflow #3 (overflow: hidden; is working!)
Overflow #4 Example (using overflow: hidden;)