diff --git a/kernel/sparkex/src/main/java/com/twosigma/beakerx/widget/SparkUIForm.java b/kernel/sparkex/src/main/java/com/twosigma/beakerx/widget/SparkUIForm.java
index 054ae0eb75..3f7ab67c2b 100644
--- a/kernel/sparkex/src/main/java/com/twosigma/beakerx/widget/SparkUIForm.java
+++ b/kernel/sparkex/src/main/java/com/twosigma/beakerx/widget/SparkUIForm.java
@@ -326,7 +326,7 @@ public void setAllToEnabled() {
     this.profileManagement.getChildren().stream().map(x -> (ValueWidget) x).forEach(x -> x.setDisabled(false));
     this.advancedOption.setEnabledToAll();
     this.connectButton.setDisabled(false);
-    this.connectButton.setDomClasses(new ArrayList<>());
+    this.connectButton.setDomClasses(new ArrayList<>(asList("bx-spark-connect")));
     this.masterURL.setDisabled(false);
     this.executorMemory.setDisabled(false);
     this.executorCores.setDisabled(false);