what theme and web browser are you using?

This looks like a margin/padding problem with your theme. I'd talk to the theme author.

Hi,  I am using Elgg 1.8.4, with Custom Index Widgets 2.4.  I want to hide only activity and member profiles from guests, but allow blogs and other pages marked as public access to be viewed by guests:

This makes the walled garden option not entirely feaseable and I am ok with altering code.

I have read about adding gatekeeper(), however can someone give me some pointers about what and where to edit?

@Christopher Neitzert Did you get ssomething my requirements are same I restricted members page from guest by adding gatekeeper(); but did not found proper file to add gatekeep(); for activity page.

Go to www folder and then in pages > river.php

add gatekeeper(); before $options = array();

It will hide activity from Guests.