Removing Search Bar

Hi, I am using the Clean Journal Child theme. I have tried adding almost all of the codes in the custom css section that you have mentioned in the forums to remove the search bar from the right header. It is not working, please help me with this. Is there any other way of doing this or am I entering the wrong code for the Clean Journal Child theme. My website url is www.hopscotchers.com Thanks a lot in advance, Prachi