ironbar/docs/Styling guide.md

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Ironbar ships with no styles by default, so will fall back to the default GTK styles.
To style the bar, create a file at `~/.config/ironbar/style.css`.
Style changes are hot-loaded so there is no need to reload the bar.
Since the bar is GTK-based, it uses [GTK's implementation of CSS](https://docs.gtk.org/gtk3/css-overview.html),
which only includes a subset of the full web spec (plus a few non-standard properties).
The below table describes the selectors provided by the bar itself.
Information on styling individual modules can be found on their pages in the sidebar.
| Selector | Description |
|---------------------|--------------------------------------------|
| `.background` | Top-level window. |
| `#bar` | Bar root box. |
| `#bar #start` | Bar left or top modules container box. |
| `#bar #center` | Bar center modules container box. |
| `#bar #end` | Bar right or bottom modules container box. |
| `.container` | All of the above. |
| `.widget-container` | The `EventBox` wrapping any widget. |
| `.widget` | Any widget. |
| `.popup` | Any popup box. |
Every Ironbar widget can be selected using a `kebab-case` class name matching its name.
You can also target popups by prefixing `popup-` to the name. For example, you can use `.clock` and `.popup-clock` respectively.
Setting the `name` option on a widget allows you to target that specific instance using `#name`.
You can also add additional classes to re-use styles. In both cases, `popup-` is automatically prefixed to the popup (`#popup-name` or `.popup-my-class`).
You can also target all GTK widgets of a certain type directly using their name. For example, `label` will select all labels, and `button:hover` will select the hover state on *all* buttons.
These names are all lower case with no separator, so `MenuBar` -> `menubar`.
> [!NOTE]
> If an entry takes no effect you might have to use a more specific selector.
> For example, attempting to set text size on `.popup-clipboard .item` will likely have no effect.
> Instead, you can target the more specific `.popup-clipboard .item label`.
Running `ironbar inspect` can be used to find out how to address an element.
GTK CSS does not support custom properties, but it does have its own custom `@define-color` syntax which you can use for re-using colours:
```css
@define-color color_bg #2d2d2d;
box, menubar {
background-color: @color_bg;
}
```