locate SearchTop as absolute

src/client/js/components/Navbar/SearchTop.jsx

@@ -61,7 +61,7 @@ class SearchTop extends React.Component {
         </div>
       )
       : (
-        <div className="grw-search-top-fixed position-fixed">
+        <div className="grw-search-top-absolute position-absolute">
           {children}
         </div>
       );

src/client/styles/scss/_search.scss

@@ -116,7 +116,7 @@
 
 // layout
 .search-top {
-  .grw-search-top-fixed {
+  .grw-search-top-absolute {
     // centering on navbar
     top: $grw-navbar-height / 2;
     left: 50vw;