diff --git a/src/App.css b/src/App.css
index a616737..ed75adb 100644
--- a/src/App.css
+++ b/src/App.css
@@ -4,3 +4,8 @@
   box-sizing: border-box;
   background: transparent;
 }
+
+button {
+  /* disable highlighting */
+  user-select: none;
+}