diff --git a/src/styles/core/extend.css b/src/styles/core/extend.css
index 50dca77..35c5254 100644
--- a/src/styles/core/extend.css
+++ b/src/styles/core/extend.css
@@ -12,6 +12,7 @@
     -webkit-transform: rotate(45deg);
     -moz-transform: rotate(45deg);
     -ms-transform: rotate(45deg);
+    -o-transform: rotate(45deg);
     transform: rotate(45deg);
     filter: none;
 }