Themes

Default Themes

Trilium comes with a couple pre-installed color themes, with the default being a light theme. To switch to a dark theme or any other available theme, navigate to the Options menu (accessible via the app icon in the top-left corner), select the Appearance tab, and choose your preferred theme.

Creating Custom CSS Themes

Trilium supports custom user themes, allowing you to personalize the application's appearance. To create a custom theme, follow these steps:

Create a CSS Code Note: Start by creating a new code note with the CSS type.
Annotate with #appTheme: Add the attribute #appTheme=my-theme-name to your note, where my-theme-name is the name of your custom theme.
Define Your Styles: Write your custom CSS within the note. Below is an example of a custom theme:

@font-face {
  font-family: 'Raleway';
  font-style: normal;
  font-weight: 400;
  src: url('/custom/fonts/raleway.woff2') format('woff2');
}

:root {
    --main-font-family: 'Raleway' !important;
    --main-font-size: normal;
    --tree-font-family: inherit;
    --tree-font-size: normal;
    --detail-font-family: inherit;
    --detail-font-size: normal;
    --detail-text-font-family: 'Garamond' !important;

    --main-background-color: #404552;
    --main-text-color: #AFB8C6;
    --main-border-color: #AFB8C6;
    --accented-background-color: #383C4A;
    --more-accented-background-color: #2F343F;
    --header-background-color: #383C4A;
    --button-background-color: #2F343F;
    --button-disabled-background-color: #404552;
    --button-border-color: #333;
    --button-text-color: #AFB8C6;
    --button-border-radius: 2px;
    --primary-button-background-color: #6c757d;
    --primary-button-text-color: white;
    --primary-button-border-color: #6c757d;
    --muted-text-color: #86919F;
    --input-text-color: #AFB8C6;
    --input-background-color: #404552;
    --hover-item-text-color: white;
    --hover-item-background-color: #4877B1;
    --active-item-text-color: white;
    --active-item-background-color: #4877B1;
    --menu-text-color: #AFB8C6;
    --menu-background-color: #383C4A;
    --tooltip-background-color: #383C4A;
    --link-color: lightskyblue;
    --modal-background-color: #404552;
    --modal-backdrop-color: black;
    --scrollbar-border-color: rgba(175, 184, 198, 0.5);
}

body .note-detail-text {
    font-size: 120%;
}

body .CodeMirror {
    filter: invert(100%) hue-rotate(180deg);
}

Activating Your Custom Theme

Once you've created your custom theme:

Go to "Menu" -> "Options" -> "Appearance."
In the theme selection dropdown, you should see your custom theme listed under the name you provided with the #appTheme label.
Select your custom theme to activate it.

If you make changes to your theme, press Ctrl + R to reload the frontend and apply your updates.

Custom themes can be exported as .tar archives, which can be shared with other users. However, be cautious when importing themes from untrusted sources, as they may contain executable scripts that could pose security risks.

An example user theme, Steel Blue, is available in the demo document.

Using Custom CSS for Specific Purposes

In addition to full themes, Trilium allows for custom CSS that isn't tied to a theme. This can be particularly useful in scripting contexts, where you might want to modify specific UI elements, such as changing the colors of notes in the tree view.

Applying Custom CSS

To use custom CSS:

Create a CSS Code Note: Create a new Code note with the CSS type.
Add the appCss Label: Annotate the note with the #appCss label.
Write Your CSS: Add your custom CSS rules to the note.

For example:

/* Custom CSS to style specific elements */
.tree-item {
    color: #ff6347; /* Change tree item color */
}

When Trilium's frontend starts, all notes labeled with appCss are automatically included in the style element of the HTML page.

After making changes, press Ctrl + R to reload the frontend and apply your new styles.

Styling Specific Notes in the Tree

To apply specific styles to certain notes in the tree:

Use the cssClass Attribute: Add the cssClass attribute to a note, and assign it a value representing the desired CSS class.
Define an iconClass: You can also define a custom icon for a note using the iconClass attribute, selecting from Box Icons or your own custom classes.

For example, if you want to style notes of a specific type, such as notes containing PNG images, you can target them with classes like type-image mime-image-png.

User-Provided Themes

A gallery of user-created themes is available, showcasing the variety of customizations that the Trilium community has developed. For more information, check the Theme Gallery.

Asset Path Management

When referencing built-in assets like images in your custom themes or CSS, you can avoid hardcoding version numbers by using the vX alias. For example, instead of specifying /assets/v0.57.0-beta/images/icon-grey.png, you can use /assets/vX/images/icon-grey.png to keep your theme compatible with future versions of Trilium.

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