diff --git a/qt/aqt/reviewer.py b/qt/aqt/reviewer.py
index 6d68f9e3a..71859d73a 100644
--- a/qt/aqt/reviewer.py
+++ b/qt/aqt/reviewer.py
@@ -919,6 +919,12 @@ timerStopped = false;
                 extra = """id="defease" """
             else:
                 extra = ""
+
+            if i == 1:
+                button_class = "answerIncorrect"
+            else:
+                button_class = "answerCorrect"
+
             due = self._buttonTime(i, v3_labels=labels)
             key = (
                 tr.actions_shortcut_key(val=aqt.mw.pm.get_answer_key(i))
@@ -926,9 +932,10 @@ timerStopped = false;
                 else ""
             )
             return """
-<td align=center><button %s title="%s" data-ease="%s" onclick='pycmd("ease%d");'>\
+<td align=center><button %s class="answerButton %s" title="%s" data-ease="%s" onclick='pycmd("ease%d");'>\
 %s%s</button></td>""" % (
                 extra,
+                button_class,
                 key,
                 i,
                 i,