--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/assets/stylesheets/bootstrap/mixins/_opacity.scss	Thu Jun 15 12:17:09 2017 +0200
@@ -0,0 +1,8 @@
+// Opacity
+
+@mixin opacity($opacity) {
+  opacity: $opacity;
+  // IE8 filter
+  $opacity-ie: ($opacity * 100);
+  filter: alpha(opacity=$opacity-ie);
+}