I think it is better to remove adding/applying stylesheets by FxViewRepository/@FxView entirely, because stylesheets can be added to FXML file directly:

/fxml/login.fxml:

<BorderPane xmlns:fx="http://javafx.com/fxml" stylesheets="@/style/login.css">
    <center>
        <Label styleClass="small-label" />

This way IntelliJ will also support navigating to the css file when clicking on the style class on FXML file, and it won't highlight style classes with yellow:

@CodeSimcoe WDYT?