Please use this CSS to center logo on mobile

@media (max-width:1023px) {
.logo_link {
 position: absolute!important;
 width: 100%!important;
 text-align: center!important;
 display: block!important;
 top: 0!important;
 right: 50px!important;
 padding-left: 100px!important;
}
}

In this article you can find information how to add custom CSS to any WordPress Theme: How to add CSS code that is future update compatible