diff --git a/github-markdown.css b/github-markdown.css
index 5d9445c..1bd00d8 100644
--- a/github-markdown.css
+++ b/github-markdown.css
@@ -5,7 +5,6 @@
 
 .markdown-body {
   -webkit-text-size-adjust: 100%;
-  -ms-text-size-adjust: 100%;
   text-size-adjust: 100%;
   color: #333;
   overflow: hidden;
@@ -193,6 +192,10 @@
   font: 12px Consolas, "Liberation Mono", Menlo, Courier, monospace;
 }
 
+.markdown-body .select::-ms-expand {
+  opacity: 0;
+}
+
 .markdown-body .octicon {
   font: normal normal normal 16px/1 octicons-anchor;
   display: inline-block;