diff --git a/style.css b/style.css
index 646851b..912c02d 100644
--- a/style.css
+++ b/style.css
@@ -1407,7 +1407,7 @@ Site Header
 	max-height: 0;
 	opacity: 0;
 	box-shadow: 0 4px 8px 1px rgba(0,0,0,0.4);
-	filter: alpha(opacity=0);
+	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
 	-webkit-transition: all .5s ease;
 	   -moz-transition: all .5s ease;
 	    -ms-transition: all .5s ease;
@@ -1424,7 +1424,7 @@ Site Header
 	z-index: 50;
 	max-height: 9999px;
 	opacity: 1;
-	filter: alpha(opacity=100);
+	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
 }
 
 
@@ -2153,7 +2153,7 @@ Media Queries
 		left: auto;
 		max-height: 9999px;
 		opacity: 1;
-		filter: alpha(opacity=100);
+		-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
 		box-shadow: none;
 	}