diff --git a/src/app/globals.css b/src/app/globals.css
index 4a4ec19..fb34cd7 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -559,3 +559,8 @@ img:hover {
 button, .button, [class*='button'], [class*='btn'] {
   background-color: #000000;
 }
+
+/* Mass style: make all buttons background black */
+button, .button, [class*='button'], [class*='btn'] {
+  background-color: #000000;
+}