how to override default assets?

I wanna to custom style for swagger,

I copy `application.css` from `grape-swagger-rails` and place into `myapp/app/assets/stylesheets/grape_swagger_rails`.

```
/*
*= require reset
*= require screen
*= require_self
*/

ul {
  margin-left: 10px;
}

```

but it throw error:

couldn't find file 'reset'
