diff --git a/css/style.css b/css/style.css
index 4650ecd..9305455 100755
--- a/css/style.css
+++ b/css/style.css
@@ -355,6 +355,9 @@ body {
 .button.reproduciblebuilds::before {
   background: #1E5B96; }
 
+.button.thunderbird::before {
+  background: #0A84FF; }
+
 .button.boxed.white {
   border: 1px solid #fff;
   background: none;
@@ -431,6 +434,15 @@ body {
   color: #fff;
   background: #1E5B96; }
 
+.button.boxed.thunderbird {
+  border: 1px solid #0A84FF;
+  background: none;
+  color: #0A84FF; }
+
+.button.boxed.thunderbird:hover {
+  color: #fff;
+  background: #0A84FF; }
+
 .button.boxed.openlabs {
   border: 1px solid #2BBBB0;
   background: none;