help with layout of comments?

Whenever I reply to comments on my site, my name and the date move down below my user photo. (See example in the comments section of this post). This doesn’t happen when other people leave comments. How can I shift my name and the date to the right of my user photo, so that all of them are on the same line? I’d just like my replies to look more compact.

Would this involve adding code to the comments.php (child theme)? Or would it be a style.css tweak (again, in my child theme)?

Any help would be appreciated!