diff --git a/docs/assets/bootstrap.zip b/docs/assets/bootstrap.zip
index 9c97bed2..84215f72 100644
Binary files a/docs/assets/bootstrap.zip and b/docs/assets/bootstrap.zip differ
diff --git a/docs/assets/css/bootstrap.css b/docs/assets/css/bootstrap.css
index f9fb6cac..dbab9040 100644
--- a/docs/assets/css/bootstrap.css
+++ b/docs/assets/css/bootstrap.css
@@ -60,6 +60,7 @@ img {
   height: auto;
   border: 0;
   -ms-interpolation-mode: bicubic;
+  vertical-align: middle;
 }
 button,
 input,