diff --git a/public/assets/css/thetool.css b/public/assets/css/thetool.css
index 136d94c5e..637343890 100644
--- a/public/assets/css/thetool.css
+++ b/public/assets/css/thetool.css
@@ -381,6 +381,11 @@ td.controls {
   border-color: #FF0088;
 }
 
+.btn-outline-natur {
+  color: #000000;
+  background-color: #FFFFCC;
+}
+
 .btn-outline-Rot-Gelb {
   color: #FFFFFF;
   border-left-color: #FF0000;