CSS Tweaks – Polished UI for Trilium

A set of CSS styles to improve readability and elegance of the TriliumNext interface.

Installation

Import CSS_Tweaks_UI_Polished.zip as an appearance note (or create a Code – CSS note with the code and apply it via settings).
Adjust the styles to your preference.
Add the label #appCss to the note's attributes.

Minimalist Scrollbars: Slimmer scrollbars (6px) with a transparent track and a subtle thumb that perfectly matches your current theme's border color.
Theme-Aware Selection: Highlighting text now uses a beautifully tinted color mixed from the main text color.
Fixed Card Links: Corrects opacity issues on card links, ensuring titles remain bold and legible while adding a smooth hover underline effect.

Centered Launcher Icons: Fixes padding conflicts to ensure left-sidebar icons are perfectly sized (14px) and centered.
Refined Note Tree: Increases padding and border-radius for tree items, making them more clickable and modern.
Active Note Highlighting: The currently active note receives a prominent blue background badge on its title and a solid left border on the node, making it impossible to lose your place.
Sleek Hover Effects: Smooth background transitions when hovering over notes in the tree.

Spacious Typography: Increases line height (1.9) and margin spacing for paragraphs and lists to improve readability.
Prominent Headers: H1, H2, and H3 tags are bolder and feature increased top and bottom margins for distinct visual hierarchy.
Auto-Hiding Toolbar: The CKEditor top toolbar now fades out (50% opacity) when you are just reading, and fully appears (100% opacity) when you focus on the editor or hover over it.

Responsive Grid: Introduces dynamic auto-fill columns with proper gaps (12px) to prevent cards from touching each other on desktop.
Flat Design: Removes default box-shadows in favor of clean, subtle 1px borders with rounded corners (8px).
Better Padding: Increases inner padding for more "breathing room" around the text.

Translucent Columns: Columns use a color-mixed semi-transparent background.
Color-Coded Headers: The first 5 columns automatically receive distinct, beautifully colored top borders (Blue, Orange, Teal, Red, Purple).
Interactive Cards: Board notes feature a subtle hover lift (translateY) and border color transition.
Refined Add Buttons: "New Item" and "Add Column" buttons have dashed borders and soft background colors on hover.

Auto-Coloring Columns: The first 15 columns are automatically color-coded with distinct, harmonious hex values for extreme data clarity.
Clean Borders: Uses semi-transparent borders for cells and headers to avoid a cluttered look.
Row Hover Effects: Entire rows softly highlight when hovered.
Refined Resize Handles: Column resize handles only appear on hover to keep headers looking clean.

Attribute Table Layout: Transforms standard promoted attributes into a clean, aligned table layout (Label: Value).
Rounded Pills: Note attributes in the list view are transformed into beautiful rounded pills with a monospace font.
Labels (#): Rendered with a soft green background and border.
Relations (~): Rendered with a soft blue background and border.

Single-Column Cards: Forces card views into a single column on mobile screens to prevent text from being squished or cut off.
Hidden Code Blocks in Cards: Hides <pre> and <code> blocks within card previews on mobile, as long lines of code (like shebangs) often break the card layout.
Always-Visible Editor Toolbar: Bypasses the auto-hiding editor toolbar on mobile, as touch devices don't have a "hover" state.
Horizontal Scroll for Tables: Markdown tables now automatically scroll horizontally on small screens to prevent the entire page from breaking its width.
Scaled Typography: Dynamically reduces font sizes for titles, headers, and UI elements to fit perfectly on smaller viewports.