diff --git a/static/themes/default/css/main.css b/static/themes/default/css/main.css
index 78c2f8631..72530145d 100644
--- a/static/themes/default/css/main.css
+++ b/static/themes/default/css/main.css
@@ -83,23 +83,6 @@ h6:not(:first-child) {
     margin-top: 2rem;
 }
 
-/* Warning colors from bootstrap 3 */
-.bg-warning,
-.btn-warning {
-    background-color: #f0ad4e !important;
-    color: #fff !important;
-}
-
-.btn-warning:hover,
-.btn-warning:active,
-.btn-warning:focus,
-.btn-warning:disabled,
-.btn-warning.disabled,
-.btn-warning[disabled] {
-    background-color: var(--warning-color) !important;
-    color: #fff !important;
-}
-
 .btn[disabled] {
     cursor: not-allowed !important;
     opacity: .65;