fixed typo

less/qfq-bs.css.less

@@ -291,7 +291,7 @@ input:focus ~ .with-errors.help-block:not(.hidden), textarea:focus ~ .with-error
 }
 
 /* Color Variation Example Start */
-.rebel-yell .has-error .form-control, .rebelYell .has-error .form-control:focus {
+.rebel-yell .has-error .form-control, .rebel-yell .has-error .form-control:focus {
   border-color: #d30b6f;
   background-color: #eb92be;
 }