diff --git a/src/css/toc.css b/src/css/toc.css
index f1a74be76b4546e2e2ad301c920674ff018cffe1..f5510f93f436e938d9d9a3c0865fb237a2a33e55 100644
--- a/src/css/toc.css
+++ b/src/css/toc.css
@@ -117,7 +117,7 @@
 
 .sidebar .chat-btn:hover {
   transition: transform 0.2s ease-in-out;
-  background-color: rgba(0, 114, 206, 0.8);
+  background-color: #005bb5;
   transform: scale(1.1);
 }
 
@@ -294,7 +294,7 @@
 }
 
 #send-btn:active {
-  opacity: 0.7;
+  background-color: #005bb5;
   transition: 0.3ms ease;
 }