Click to play for HTML embedded games

I have an issue with my html5 game in that it loads but doesn’t always become interactive. Sometimes it works, and other times it just sits on the menu screen. It works every time locally and elsewhere. I assume it’s some sort of focus thing, so I wonder if the click to run embed would help address this as well. So if i could enable it on my game that would be good.

Is there a way to style the click to enable functionality? If I could add a background image then it would add a bit more personality to the experience.