Add line break in Wordpress Post Title

Add line break in Wordpress Post Title

I have long post titles in my wordpress website.
what I would like to do, is insert a line break so that the post title
take up 2 lines.
I have been able to achieve this by using < b r > (no spaces) within my
post title.
The problem is now, that wordpress is duplicating my post title
"background" image for the second line. So now there are two "rectangles"
underneath each other - each with a line of text.
How could I prevent the post title image from duplicating, and keep both
lines of text within the one rectangular post title image?
Thank you