Adjust Position of Mobile Search on Storefront

The Storefront theme adds a navigation bar to mobile devices with shortcuts to account, cart and search. It is called the handheld footer bar.

Handheld search bar screenshot
You can adjust the position of the search input field using the selector

.storefront-handheld-footer-bar ul li.search.active .site-search

Example:

.storefront-handheld-footer-bar ul li.search.active .site-search{
   margin-bottom:22px;
}