diff --git a/introjs.css b/introjs.css
index a65052811..cc66a0a37 100644
--- a/introjs.css
+++ b/introjs.css
@@ -58,6 +58,16 @@ tr.introjs-showElement > th {
           transition: all 0.3s ease-out;
 }
 
+.introjs-helperLayer *,
+.introjs-helperLayer *:before,
+.introjs-helperLayer *:after {
+  -webkit-box-sizing: content-box;
+     -moz-box-sizing: content-box;
+      -ms-box-sizing: content-box;
+       -o-box-sizing: content-box;
+          box-sizing: content-box;
+}
+
 .introjs-helperNumberLayer {
   position: absolute;
   top: -16px;