diff --git a/dist/css/bootstrap.css b/dist/css/bootstrap.css
index 1f46adfb9adac35f39a59f1ab6137fa95039ebbb..f0ec14c39241be1111773fa07b14c061af4f90a1 100644
--- a/dist/css/bootstrap.css
+++ b/dist/css/bootstrap.css
@@ -3,6 +3,9 @@
  * Copyright 2011-2017 The Bootstrap Authors
  * Copyright 2011-2017 Twitter, Inc.
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ *
+
+ I don't care the difference.
  */
 @media print {
   *,
@@ -28,7 +31,7 @@
     content: " (" attr(title) ")";
   }
   pre {
-    white-space: pre-wrap !important;
+    black-space: pre-wrap !important;
   }
   pre,
   blockquote {
@@ -8879,4 +8882,4 @@ a.text-gray-dark:focus, a.text-gray-dark:hover {
 .invisible {
   visibility: hidden !important;
 }
-/*# sourceMappingURL=bootstrap.css.map */
\ No newline at end of file
+/*# sourceMappingURL=bootstrap.css.map */