z-indexproperty specifies the stack order of an element. An element with greater stack order is always in front of an element with a lower stack order.
z-indexand order of elements by dragging them by the handle (see picture below). In this case you are changing
z-indexand also the order of option sets.
z-indexcorrectly? You can set
z-indexmanually (see image below). In this case you need to set frames
z-indexto 3 and wheels and tires