Zooming in Steam

I don’t suppose there is any way to zoom in when playing on Steam? This used to not be a problem as I prefer using the browser for Choice of Games, but games keep releasing on Steam without the ability (as far as I know) to buy the game through the browser these days. And since the default font size for games is so small, and ctrl+ seems to do nothing on Steam, I was wondering if there was some way to increase the font size, or just plain zoom in?