I believe this should work.
Add following rules to the bottom of your custom.css file
.slideshow-wrapper > .animated:nth-child(1) {
z-index: 4;
}
.slideshow-wrapper > .animated:nth-child(2) {
z-index: 3;
}
.slideshow-wrapper > .animated:nth-child(3) {
z-index: 2;
}
.slideshow-wrapper > .animated:nth-child(4) {
z-index: 1;
}
The issue is with z-index of each animated block. The above set of rules will arrange them one below the other.
Let me know if this works.