z-index of 1 stops it from being above the icons

If you make the browser narrow with this plugin enabled you can lose the overflow of the icons.

Changing z-index to 1 means the buttons take z-index priority of the video, this isn't a perfect fix because really on a redraw/overflow event you want to bring the video down a bit.

Ultimately the cause of this bug is that the way we handle the toolbar redrawing when it's too narrow is a bit shoddy.

Any idea why you used z-index 400?  I didn't test much btw so please do so..