gadget/searchbar: added responsive css

modules/ui/searchbar/searchbar.css

@@ -8,7 +8,7 @@
 
 .searchbar_wrap {
   width: 74%;
-  margin: 1em auto;
+  margin: 0 auto;
 }
 .searchbar_wrap .ui-input-search input {
   padding-left: 0.25em;
@@ -23,6 +23,7 @@
 /* Responsive CSS */
 @media (max-width: 40em) {
   .searchbar_wrap {
-    width: 100%;
+    width: 80% /* need to fit buttons left and right */;
+    min-width: 80px /* display placeholder */;
   }
 }
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