diff --git a/css/twitter_bootstrap.css b/css/twitter_bootstrap.css
index be33f95..72f0bc0 100644
--- a/css/twitter_bootstrap.css
+++ b/css/twitter_bootstrap.css
@@ -76,6 +76,14 @@ input, textarea, select, .uneditable-input {
   width:auto;
 }
 
+/* Default textfield styles inside vertical tabs */
+.vertical-tabs .form-type-textfield input {
+  -moz-box-sizing: inherit;
+  -webkit-box-sizing: inherit;
+  box-sizing: inherit;
+  width: auto;
+}
+
 /* throbber fix */
 html.js input.form-autocomplete {
   background-position: 100% 7px; /* LTR */
@@ -98,4 +106,4 @@ input.error {
   margin-top: 45px;
   padding: 35px 0 36px;
   border-top: 1px solid #E5E5E5;
-}
\ No newline at end of file
+}