diff --git a/core/src/main/scala/org/apache/spark/ui/UIUtils.scala b/core/src/main/scala/org/apache/spark/ui/UIUtils.scala
index 315327c3c6b7c39981fec36644d3fb8fd619ee7f..d970fa30c1c352c4006e899fdff70a2056e1921b 100644
--- a/core/src/main/scala/org/apache/spark/ui/UIUtils.scala
+++ b/core/src/main/scala/org/apache/spark/ui/UIUtils.scala
@@ -181,7 +181,9 @@ private[spark] object UIUtils extends Logging {
</li>
}
val helpButton: Seq[Node] = helpText.map { helpText =>
- <a data-toggle="tooltip" data-placement="bottom" title={helpText}>(?)</a>
+ <sup>
+ (<a data-toggle="tooltip" data-placement="bottom" title={helpText}>?</a>)
+ </sup>
}.getOrElse(Seq.empty)
<html>