What No One Told You About Z-Index
Don't we love CSS? it's so easy to do both complex things like 3D animations but also simple things like position something centered horizontally or vertically by just saying align:center, oh, sorry, it's margin: 0 auto, right, no? it's left:50% with a relative inside an absolute div, or was that an absolute div inside a relative span?ok so doing it vertically is really easy, it's valign:middle, oh, wait, I'm confusing yucky table layout, it's much simpler, it's, ehm, line-height or something, or vertical-align, but only for text, sorry, silly of me, I just do top:50 and the relative inside absolute trick again (or vice versa, one sec let me check in JSFiddle),Ok aligning might not be a good example, but it's so easy to  have something snap to something else, like this DIV top right corner should always be on the buttom left of that other div, oh, can't do without some jQuery code? of course you can, let me go to codepen and show you for a sec, ok, never mind that, at least it's so easy to columns (more than exactly 3) that one of them is fixed width and the others are variable width, that's why we have float:left, float:right and well, nevermind.But I can  have a left navigation bar that will stretch to the bottom, or have a footer that will stay down when resizing, it's all easy and done without any workarounds or tricks or endless trips to stackoverflow or using zurb foundation / bootstrap.So I'm surprised that a simple thing like putting something on top of the other got to be so complicated, well, you can't have it all, nothing is perfect