diff --git a/app/css/custom.php b/app/css/custom.php
index 33a59c58..d9dcbf1c 100644
--- a/app/css/custom.php
+++ b/app/css/custom.php
@@ -42,7 +42,7 @@ body {
   background-color: #fff;
 }
 
-.btn-primary.disabled {
+.btn-primary:disabled {
   color: <?php echo $color; ?> !important;
   border-color: <?php echo $color; ?> !important;
   background-color: #fff !important;