Update parameter <select> elements to render 'invalid' classes. Add '.invalid' CSS for <select> elements. Rework validateParam() function. Added .btn-sm class for "Add item" and "Remove item" buttons in array parameters. Reduce border-width on <select> elements inside parameters. Update tests for utils.validateParam().

src/style/_form.scss

@@ -21,6 +21,10 @@ select
 
         background: #f7f7f7;
     }
+
+    &.invalid {
+        @include invalidFormElement();
+    }
 }
 
 .opblock-body select
@@ -53,12 +57,8 @@ input[type=file]
     border-radius: 4px;
     background: #fff;
 
-    &.invalid
-    {
-        animation: shake .4s 1;
-
-        border-color: $_color-delete;
-        background: lighten($_color-delete, 35%);
+    &.invalid {
+        @include invalidFormElement();
     }
 }