What prevents search pages from displaying after reducing the screen size in WordPress?

Question

WordPress

Dear colleagues!
I am making a very simple custom website on WordPress + Woocommerce. After connecting <?php get_search_form(); ?> - everything works fine on desktop. But on mobile and tablet, there are just blank pages. Please tell me what I did wrong. Here is the link: https://pamyatnikshostka.com/ (it is still under development). Thanks