Spread passage background according to image size

Question

Hey guys,

I'm not sure how to describe my problem (and that's the reason why I can't find the solution), I simply need the .passage background to spread out so it includes the image. I uploaded two images to imgbox, first one is what I have, second one is what I need.

In my stysheet, my passage look like this:

.passage {
  width:750px;
  	margin-top: 0px;
	color: #ffffff;
	padding-top: 0px;
	padding-left: 30px;
	padding-right: 30px;
	border-radius: 10px;
	border:10px outset #ffa2df;
	border-width:10px;
	border-color:#ffa2df;
    background: #0a001a;
}

and the image:

img.style01 {
	max-width:60%;
	max-height:85vh;
  	margin-left:10px;
  	float:right;
  	border:5px solid white;
	}

(Sugarcube 2.21, Twine 2)

Thanks a lot for the answer!