diff --git a/main/css/base.css b/main/css/base.css
index 4065870f87..85b3534339 100755
--- a/main/css/base.css
+++ b/main/css/base.css
@@ -5155,20 +5155,21 @@ i.size-32.icon-new-note{
         padding: 10px 0px 10px 40px;
         background-repeat:no-repeat;
     }
-    select#question_type_hidden option[value="1"] {background-image: url(../img/icons/32/mcua.gif);}
-    select#question_type_hidden option[value="2"] {background-image: url(../img/icons/32/mcma.gif);}
-    select#question_type_hidden option[value="3"] {background-image: url(../img/icons/32/fill_in_blanks.gif);}
-    select#question_type_hidden option[value="4"] {background-image: url(../img/icons/32/matching.gif);}
-    select#question_type_hidden option[value="5"] {background-image: url(../img/icons/32/open_answer.gif);}
-    select#question_type_hidden option[value="6"] {background-image: url(../img/icons/32/hotspot.gif);}
-    select#question_type_hidden option[value="7"] {background-image: url(../img/icons/32/mcma.gif);}
-    select#question_type_hidden option[value="8"] {background-image: url(../img/icons/32/mcma.gif);}
-    select#question_type_hidden option[value="9"] {background-image: url(../img/icons/32/mcmac.gif);}
-    select#question_type_hidden option[value="10"] {background-image: url(../img/icons/32/mcuao.gif);}
-    select#question_type_hidden option[value="11"] {background-image: url(../img/icons/32/mcmao.gif);}
-    select#question_type_hidden option[value="12"] {background-image: url(../img/icons/32/mcmaco.gif);}
+    select#question_type_hidden option[value="1"] {background-image: url(../img/icons/32/mcua.png);}
+    select#question_type_hidden option[value="2"] {background-image: url(../img/icons/32/mcma.png);}
+    select#question_type_hidden option[value="3"] {background-image: url(../img/icons/32/fill_in_blanks.png);}
+    select#question_type_hidden option[value="4"] {background-image: url(../img/icons/32/matching.png);}
+    select#question_type_hidden option[value="5"] {background-image: url(../img/icons/32/open_answer.png);}
+    select#question_type_hidden option[value="6"] {background-image: url(../img/icons/32/hotspot.png);}
+    select#question_type_hidden option[value="7"] {background-image: url(../img/icons/32/mcma.png);}
+    select#question_type_hidden option[value="8"] {background-image: url(../img/icons/32/mcma.png);}
+    select#question_type_hidden option[value="9"] {background-image: url(../img/icons/32/mcmac.png);}
+    select#question_type_hidden option[value="10"] {background-image: url(../img/icons/32/mcuao.png);}
+    select#question_type_hidden option[value="11"] {background-image: url(../img/icons/32/mcmao.png);}
+    select#question_type_hidden option[value="12"] {background-image: url(../img/icons/32/mcmaco.png);}
     select#question_type_hidden option[value="13"] {background-image: url(../img/icons/32/audio_question.png);}
-    select#question_type_hidden option[value="14"] {background-image: url(../img/icons/32/mcmagl.gif);}
+    select#question_type_hidden option[value="14"] {background-image: url(../img/icons/32/mcmagl.png);}
+    select#question_type_hidden option[value="16"] {background-image: url(../img/icons/32/calculated_answer.png);}
 }