There is a horizontally centered youtube video on the page, but the problem is that on mobile devices (phones/tablets) it takes time before the the video loads (sometimes 1.5 secs). So during this time the area which is designated for a video appears to be blank. So people might think that there is nothing there and move on.
So I tried to make a background text (underneath the video) saying 'Video is loading'. After looking how to make background text, I found the following answer. I tried both approaches (with ::before and with another div inside, but with no success).
Here is my fiddle with the closest I was able to get. Opacity there is just to see that the text is behind the video. And here is my failed part of CSS (just here because SO reject posts without code and with jsfiddle).
.video-preloader{
position: relative;
text-align:center;
top: 0;
left: 0;
bottom: 0;
right: 0;
z-index: -1;
overflow: hidden;
}