diff --git a/gulpfile.js/tasks/styles.js b/gulpfile.js/tasks/styles.js
index adf2b1fb2..6c34e13d4 100644
--- a/gulpfile.js/tasks/styles.js
+++ b/gulpfile.js/tasks/styles.js
@@ -26,6 +26,7 @@ var cssnanoConfig = {
     discardUnused: {
         fontFace: false,
     },
+    zindex: false,
 };
 
 gulp.task('styles', ['styles:sass', 'styles:css', 'styles:assets']);