diff --git a/css/twentytwenty.css b/css/twentytwenty.css
index cad8aa4..e42c889 100644
--- a/css/twentytwenty.css
+++ b/css/twentytwenty.css
@@ -82,7 +82,8 @@
   overflow: hidden;
   position: relative;
   -webkit-user-select: none;
-  -moz-user-select: none; }
+  -moz-user-select: none;
+  -ms-user-select: none; }
   .twentytwenty-container img {
     max-width: 100%;
     position: absolute;