This option controls the vertical stacking order of layers that overlap. In CSS, it’s commonly called as z-index. Elements with a higher value are stacked in front of elements with a lower one, effectively covering them. By default, this value is calculated automatically based on the order of your layers, thus simply re-ordering them can fix overlap issues. Use this option only if you want to set your own value manually in special cases like using static layers.<br><br>On each slide, the stacking order starts counting from 100. Providing a number less than 100 will put the layer behind every other layer on all slides. Specifying a much greater number, for example 500, will make the layer to be on top of everything else.