When search form requires only a single input field, the search_form_box component
can be used to create a compact search form with a single input field and a
submit button.
Depending on implementation of search form, it may be impossible to achieve
exactly the same appearance of the form as in search_form component. For
example, in search_form, input and submit button may share the
same wrapepr and render inline. At the same time, inside search_form_box they
are likely to be rendered inside separate conainers. As result, they will
be shown on different lines.