Fix margin & padding on activity btn

## What does this MR do?
Fixes alignment of activity btn

## What are the relevant issue numbers?
Closes #18762 

## Screenshots (if relevant)
![Screen_Shot_2016-06-17_at_9.29.06_AM](/uploads/4ab9fb33d450dda72811a5ce2570b8c7/Screen_Shot_2016-06-17_at_9.29.06_AM.png)


See merge request !4750