diff --git a/docs/assets/css/bootstrap.css b/docs/assets/css/bootstrap.css
index f1e5dfa03..118aa4923 100644
--- a/docs/assets/css/bootstrap.css
+++ b/docs/assets/css/bootstrap.css
@@ -3659,6 +3659,7 @@ button.close {
 .btn-group-vertical > .btn {
   display: block;
   float: none;
+  width: 100%;
   max-width: 100%;
 }
 
diff --git a/less/button-groups.less b/less/button-groups.less
index 8a83ab3f2..9e6eaa496 100644
--- a/less/button-groups.less
+++ b/less/button-groups.less
@@ -126,6 +126,7 @@
 .btn-group-vertical > .btn {
   display: block;
   float: none;
+  width: 100%;
   max-width: 100%;
 }
 .btn-group-vertical .btn:first-child {