AMBARI-7261. Slider View: Remove gray background on pages of create app wizard (alexantonenko)

contrib/views/slider/src/main/resources/ui/app/styles/application.less

@@ -334,6 +334,9 @@ a {
   }
   .slider-modal-body {
     max-height: 505px;
+    .wizard-content{
+      background-color: #ffffff;
+    }
   }
   .next-btn {
     margin-left: 5px;