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joplin/readme/api/references/plugin_theming.md

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# Plugin theming
## CSS
Plugins add custom content to the UI using [webview panels](https://joplinapp.org/api/references/plugin_api/classes/joplinviewspanels.html). The HTML content of a a panel is styled with CSS.
To keep the look and feel of a plugin consistent with the rest of the Joplin UI, you are automatically provided with variables derived from the current theme.
Variables follow the naming convention `--joplin-{property}` and are used in your plugin's stylesheet as shown here.
```css
/* webview.css */
.container {
color: var(--joplin-color);
font-family: var(--joplin-font-family);
}
```
## Icons
In addition to variables, you have access to a set of standard font assets that ship with Joplin. These include:
* [Roboto](https://fonts.google.com/specimen/Roboto?preview.text_type=custom) - (the standard UI font, `font-family` referenced above)
* [Font Awesome](https://fontawesome.com/icons?d=gallery&p=2&m=free) - icon library
* [icoMoon](https://icomoon.io/#preview-free) - icon library (subset, see [style.css](https://github.com/laurent22/joplin/blob/dev/packages/app-desktop/style/icons/style.css))
To display an icon, use CSS and HTML like the following.
```css
/* style icons to match the theme */
.toolbarIcon {
font-size: var(--joplin-toolbar-icon-size);
}
.primary {
color: var(--joplin-color);
}
.secondary {
color: var(--joplin-color-2);
}
```
```html
<i class="toolbarIcon primary fas fa-music"></i> Font Awesome music icon
<br />
<i class="toolbarIcon secondary icon-notebooks"></i> icoMoon notebook icon
```