Trilium/docs/User Guide/User Guide/Theme development/Custom app-wide CSS.md

Custom app-wide CSS

It is possible to provide a CSS file to be used regardless of the theme set by the user.

	Start by creating a new note and changing the note type to CSS
	In the ribbon, press the “Owned Attributes” section and type #appCss.
	Type the desired CSS.  Generally it's a good idea to append !important for the styles that are being changed, in order to prevent other

Seeing the changes

Adding a new app CSS note or modifying an existing one does not immediately apply changes. To see the changes, press Ctrl+Shift+R to refresh the page first.

Sample use cases

Customizing the printing stylesheet

When printing a document or exporting as PDF, it is possible to adjust the style by creating a CSS note that uses the @media selector.

For example, to change the font of the document from the one defined by the theme or the user to a serif one:

@media print {
	body {
        --main-font-family: serif !important;
        --detail-font-family: var(--main-font-family) !important;
    }
}

Per-workspace styles

When using Workspaces, it can be helpful to create a visual distinction between notes in different workspaces.

To do so:

1. In the note with #workspace, add an inheritable attribute #cssClass(inheritable) with a value that uniquely identifies the workspace (say my-workspace).
2. Anywhere in the note structure, create a CSS note with #appCss.

Change the color of the icons in the Note Tree

.fancytree-node.my-workspace.fancytree-custom-icon {
    color: #ff0000;
}

Change the color of the note title and the icon

To change the color of the note title and the icon (above the content):

.note-split.my-workspace .note-icon-widget button.note-icon,
.note-split.my-workspace .note-title-widget input.note-title {
    color: #ff0000;
}

Add a watermark to the note content

1. Insert an image in any note and take the URL of the image.
2. Use the following CSS, adjusting the background-image and width and height to the desired values.

.note-split.my-workspace .scrolling-container:after {
    position: fixed;
    content: "";
    background-image: url("/api/attachments/Rvm3zJNITQI1/image/logo.png");
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    width: 237px;
    height: 44px;
    bottom: 1em;
    right: 1em;
    opacity: 0.5;
    z-index: 0;
}