Turn Off Responsive Design

If you want your website to simply display exactly the same across all devices, without the content adapting and resizing to different screen sizes, add the following CSS:

body, #wrapper{min-width:1000px !important}
@media all and (max-width:767px){#menu label.toggle{display:none}#menu ul{display:inline}}
@media all and (max-width:320px){#hsidebar, #header, #menu #s, #content, #sidebar, #lsidebar, #rsidebar, #footer, #fsidebar, #menu ul li a, #menu ul li a:hover, #menu #s{width:inherit;max-width:inherit}#menu .sub-menu, #menu .children{left:0;margin-left:0 !important}}

https://startupwp.com/topic/customizing-your-theme/