Window Preview - Space between panel and preview, and preview styles.
Hi,I've been using the `xfce4-docklike-plugin` from ppa xubutnu-dev extras, the version I'm using is: `0.4.2-0ppa1~bpo24.04`
I've been able to style it pretty much like I wanted to, but few things are missing:
1. I'd like to make the Window Preview "float", to have some space between the panel and the Window Preview. \
I've been trying for this is to make `background-color: transparent;` and add some `margin`, but I cannot access the `window` specifically for the `docklike-plugin`. It is the white part in this image. \
\
When viewing the Css Selectors, it seems like it is the `window.background` that could do the trick but it also used many times in many other window and not just inside the panel.\

2. When the window is minimized, I want the preview to be smaller. I did not achieve to reduce the yellow part.\

Here is the `css` I've been playing with for the moment:
```css
box.menu.horizontal{
background-color: greenyellow;
border-radius: 10px;
margin: 15px;
padding: 5px;
}
box.menu>widget.active_menu_item.menu_item{
background-color: red;
border-radius: 10px;
padding:0;
margin:0;
}
box.menu>widget.active_menu_item.menu_item>grid{
background-color: magenta;
padding:0;
margin:0;
}
box.menu>widget.active_menu_item.menu_item>grid>image:first-child{
background-color: green;
padding:0;
margin:0;
}
box.menu>widget.active_menu_item.menu_item>grid>image:last-child{
background-color: yellow;
padding:0;
margin:0;
}
box.menu>widget.active_menu_item.menu_item>grid>label{
background-color: aqua;
padding:0;
margin:0;
}
box.menu>widget.active_menu_item.menu_item>grid>button{
background-color: blue;
padding:0;
margin:0;
}
```
Thanks for your time and help, and for this awesome plugin!!
issue