Hide text in H1 tag but not the image

I need to hide the text inside a H1 tag. But not the image. Problem is that i only can change the css and not the html ``` <h1> <img src="img/headerimg.png" width="900" height="125"/> Header 1 text </h1> ``` Is there a way to only hide the "Header 1 text" with only css? I'm doing this for big client and they gave me only acces to the css file.