diff --git a/Bootstrap.Client/wwwroot/css/theme.css b/Bootstrap.Client/wwwroot/css/theme.css
index ba531cf5..e3502a39 100644
--- a/Bootstrap.Client/wwwroot/css/theme.css
+++ b/Bootstrap.Client/wwwroot/css/theme.css
@@ -1,4 +1,4 @@
-body, .form-control, .dropdown-menu, .btn:not(.btn-lg), .input-group-text {
+body, .form-control, .dropdown-menu, .btn:not(.btn-lg), .input-group-text, .popover-header {
     font-size: 0.875rem;
 }