Masthead/Mobile Menu Icon Height

I am trying to remove extra space in what I believe to be the masthead area. I have the following css in the Custom CSS. @media screen and (min-width:990px) {#site-branding, #masthead { display:none; } } It successfully removes all the white space above the top-line menu at larger screen sizes and allows the mobile menu icon to appear at smaller screen sizes. What I would also like to do is reduce the height of the mobile menu icon so it only takes up the height of the icon, but I can't figure out how to get at that element. My test URL: http://everygoodgift.org/wptest/