diff --git a/docs/assets/bootstrap.zip b/docs/assets/bootstrap.zip
index 7d65680eca..6f6c38e34a 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 e3572169d9..a0a18e8964 100644
--- a/docs/assets/css/bootstrap.css
+++ b/docs/assets/css/bootstrap.css
@@ -3541,6 +3541,7 @@ a.thumbnail:hover {
   font-weight: bold;
   line-height: 13px;
   color: #ffffff;
+  vertical-align: middle;
   white-space: nowrap;
   text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
   background-color: #999999;
diff --git a/less/labels.less b/less/labels.less
index 251c4f60d1..918b12e8c9 100644
--- a/less/labels.less
+++ b/less/labels.less
@@ -8,6 +8,7 @@
   font-weight: bold;
   line-height: 13px; // ensure proper line-height if floated
   color: @white;
+  vertical-align: middle;
   white-space: nowrap;
   text-shadow: 0 -1px 0 rgba(0,0,0,.25);
   background-color: @grayLight;