UICssLayout (linkki Databinding and Core Framework for Vaadin 23 2.3.11 API)

```
@Retention(RUNTIME)
@Target(TYPE)
@LinkkiBoundProperty(org.linkki.core.binding.descriptor.property.annotation.BoundPropertyCreator.EmptyPropertyCreator.class)
public @interface UICssLayout
```
Marks a group of components in a Div. It provides a simple DOM structure, which can be freely styled by CSS. There is no predefined layouting information. Notable differences to other layouts are
- Simpler DOM structure.
- Full developer control without the restriction of templates.
- Developer is responsible for cross-browser consistency
- Relative size calculations may differ in some situations
- Faster rendering in some situations
To use this, annotate a class with UICssLayout that includes regular UI element annotations like @UITextField on its methods. Call VaadinUiCreator.createComponent(Object, org.linkki.core.binding.BindingContext) with an instance of that class to create the UICssLayout and its children.
Use the styleNames() attribute to designate one or more css classes for this component. If no names are given, the Vaadin default CSS class name is "csslayout".
Implementation Note:

Uses HasStyle.setClassName(String) to set the style class.

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  String[] styleNames
  It is recommended that you declare a CSS class in order to style this and contained elements.

- Element Detail
  - styleNames
```
String[] styleNames
```
    It is recommended that you declare a CSS class in order to style this and contained elements. These style names are statically applied to the layout. In order to get dynamic style names use the functionality of @BindStyleNames.
    
    Default:
    
    {}