There are some CSS styles missing for the Spaces List macro in the current Confluence version. I attached screenshots of a version were it was working and the current one. I tested this with the current Internet Explorer and Firefox. It doesn't matter if I use

or

. The output is the same. It also doesn't matter if I use the macro on the dashboard or a regular page. Depending on the window size and the length of the space descriptions, the icons wrap into two or three rows. I've never seen it in a single row even without space description.