Steps to Reproduce

http://zkfiddle.org/sample/34d15be/1-toast-obstructed-by-borderlayout

Current Result

Expected Result

toast on top

Debug Information

.z-center is position: absolute and z-index: 8.

.z-toast-position is position: fixed but no z-index. (position: fixed creates a new stacking context: https://stackoverflow.com/a/14491860)

Workaround

<style>
  .z-toast-position {
    z-index: 1800;  
  }
</style>