adjust search box

src/client/js/components/HeaderSearchBox.jsx

@@ -66,10 +66,10 @@ class HeaderSearchBox extends React.Component {
     const isReachable = config.isSearchServiceReachable;
 
     return (
-      <div className={`form-group ${isReachable ? '' : 'has-error'}`}>
+      <div className={`form-group mb-0 ${isReachable ? '' : 'has-error'}`}>
         <div className="input-group flex-nowrap">
           <div className="input-group-prepend">
-            <button className="btn btn-secondary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true">
+            <button className="btn btn-secondary dropdown-toggle py-0" type="button" data-toggle="dropdown" aria-haspopup="true">
               {scopeLabel}
             </button>
             <div className="dropdown-menu">