put site description below logo

I'd like to tinker just a little bit with the lovely Kathmandu free theme, using a child theme. I don't want to display the site-title, because the logo contains that phrase. So I said h1#site-title { display: none; } which is working well. I would like the site-description to appear just below the logo. I've tried a few different things with css, which haven't worked. I rather thought I should go into header.php and put in a clear statement, but apparently the code I'm looking for is in custom-header.php, and I don't know how to make a change in that in a child theme. It's important to me that my child theme still be responsive. Thank you!