Notes/docs/User Guide/User Guide/Theme development/Creating a custom theme.md
2025-03-16 14:45:21 +02:00

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# Creating a custom theme
## Step 1. Find a place to place the themes
Organization is an important aspect of managing a knowledge base. When developing a new theme or importing an existing one it's a good idea to keep them into one place.
As such, the first step is to create a new note to gather all the themes.
!\[\](4\_Creating%20a custom theme\_im.png)
## Step 2. Create the theme
| | |
| --- | --- |
| ![](Creating%20a%20custom%20theme_im.png) | Themes are code notes with a special attribute. Start by creating a new code note. |
| !\[\](Creating%20a%20custom theme\_im.png) | Then change the note type to a CSS code. |
| !\[\](5\_Creating%20a%20custom theme\_im.png) | In the _Owned Attributes_ section define the `#appTheme` attribute to point to any desired name. This is the name that will show up in the appearance section in settings. |
## Step 3. Define the theme's CSS
As a very simple example we will change the background color of the launcher pane to a shade of blue.
To alter the different variables of the theme:
```css
:root {
--launcher-pane-background-color: #0d6efd;
}
```
## Step 4. Activating the theme
Refresh the application (Ctrl+Shift+R is a good way to do so) and go to settings. You should see the newly created theme:
!\[\](1\_Creating%20a%20custom theme\_im.png)
Afterwards the application will refresh itself with the new theme:
!\[\](3\_Creating%20a%20custom theme\_im.png)
Do note that the theme will be based off of the legacy theme. To override that and base the theme on the new TriliumNext theme, see: [Theme base (legacy vs. next)](Customize%20the%20Next%20theme.md)
## Step 5. Making changes
Simply go back to the note and change according to needs. To apply the changes to the current window, press Ctrl+Shift+R to refresh.
It's a good idea to keep two windows, one for editing and the other one for previewing the changes.