Account Management: The "search" button is always inactive

Steps:

1. Go to Account Management
2. Insert anything in a search box
3. Hover the mouse pointer over the "search" button (see attachment)
4. Click the "search" button

Expected result:

The "search" button is active (changes the mouse pointer) and clickable.

Actual result:

The mouse pointer doesn't change when hovered over the "search" button, nothing happens after clicking the button (searching works without clicking anything).

Additional information: 

Applies to all search boxes in Account Management.