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i have following in my  /themes/classic/assets/css/custom.csscustom.css : 

/*
 * Custom code goes here.
 * A template should always ship with an empty custom.css
 */
div#_desktop_top_menu {
    float: right;
}

and following  in my    /modules/ps_searchbar/ps_searchbar.css  :

@media only screen and (min-width: 768px) {
  #search_widget {
    float: left;
    margin-bottom: 0;
  }

but the goal is not achieved.

are these changes OK ?