Improve query panel styling

Change-Id: I75e22de40b92ad5fd90490473da3199933e149bb
diff --git a/dev/scss/header/header.scss b/dev/scss/header/header.scss
index 763c20e..78fa532 100644
--- a/dev/scss/header/header.scss
+++ b/dev/scss/header/header.scss
@@ -128,4 +128,17 @@
       content: $fa-logout;
     }
   }
+}
+
+
+.query.button-group > span {
+  border-top-width: 0;
+  border-color: white;
+  
+  &:first-child {
+    border-top-left-radius: 0;
+  }
+  &:last-child {
+    border-top-right-radius: 0;
+  }
 }
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