Remove Search Box in Topics list pages

How do you remove or hide the Search box from the Topics list as seen in this screenshot?



I already tired this code below and it didn't work. My guess is its for the Search box on the index page because it did not remove the Search box from the Topics list page.

I use phpbb3

Code:

    #search{
    display:none;
    }

Try Change " # " to " . "

didn't work

Try this

Code:

#forum-search {
    display: none;
}

Yes that worked, thanks Matti.