ux(import): minor fixes

public/app/features/dashboard/partials/graphiteImport.html

 <div ng-controller="GraphiteImportCtrl" ng-init="init()">
 
 	<div ng-if="datasources.length > 0">
-		<h2 style="margin-top: 30px;">Load dashboard from Graphite-Web</h2>
+		<h2 class="page-heading">Load dashboard from Graphite-Web</h2>
 
 		<div class="gf-form-group">
 			<div class="gf-form-inline">
 				<div class="gf-form">
 					<span class="gf-form-label width-10">Data source</span>
 				</div>
-				<div class="gf-form width-30">
+				<div class="gf-form">
 					<div class="gf-form-select-wrapper">
-						<select type="text" ng-model="options.sourceName" class="gf-form-input max-width-10" ng-options="f for f in datasources">
+						<select type="text" ng-model="options.sourceName" class="gf-form-input gf-size-auto" ng-options="f for f in datasources">
 						</select>
 					</div>
 				</div>
 				<div class="gf-form">
-					<button class="btn btn-inverse pull-right" ng-click="listAll()">List dashboards</button>
+					<button class="btn btn-success pull-right" ng-click="listAll()">List dashboards</button>
 				</div>
 			</div>
 		</div>