diff --git a/library.css b/library.css
index 4aeeec1..ddf8384 100644
--- a/library.css
+++ b/library.css
@@ -2201,3 +2201,11 @@ div.cdk-overlay-container.modal-select {
     padding: 15px 0;
     border-radius: 4px;
 }
+
+
+/* theme*/
+.uk-h1, .uk-h2, .uk-h3, .uk-h4, .uk-h5, .uk-h6,
+.uk-heading-2xlarge, .uk-heading-large, .uk-heading-medium,
+.uk-heading-small, .uk-heading-xlarge, h1, h2, h3, h4, h5, h6 {
+    font-family: "Open Sans", sans-serif !important;
+}