# Make Interfaces Feel Better

Design engineering principles for making interfaces feel polished.

- Repository: https://github.com/kortix-ai/suna (20345 stars)
- Category: Design
- License: see repository
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add kortix-ai/suna --skill make-interfaces-feel-better -g -a claude-code -y`
Codex: `npx skills add kortix-ai/suna --skill make-interfaces-feel-better -g -a codex -y`
Cursor: `npx skills add kortix-ai/suna --skill make-interfaces-feel-better -g -a cursor -y`
Gemini CLI: `npx skills add kortix-ai/suna --skill make-interfaces-feel-better -g -a gemini-cli -y`

## Description

Design engineering principles for making interfaces feel polished. Use when building UI components, reviewing frontend code, implementing animations, hover states, shadows, borders, typography, micro-interactions, enter/exit animations, or any visual detail work. Triggers on UI polish, design details, "make it feel better", "feels off", stagger animations, border radius, optical alignment, font smoothing, tabular numbers, image outlines, box shadows.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Details that make interfaces feel better

Great interfaces rarely come from a single thing. It's usually a collection of small details that compound into a great experience. Apply these principles when building or reviewing UI code.

## Quick Reference

| Category | When to Use |
| --- | --- |
| [Typography](typography.md) | Text wrapping, font smoothing, tabular numbers |
| [Surfaces](surfaces.md) | Border radius, optical alignment, shadows, image outlines, hit areas |
| [Animations](animations.md) | Interruptible animations, enter/exit transitions, icon animations, scale on press |
| [Performance](performance.md) | Transition specificity, `will-change` usage |

## Core Principles

### 1. Concentric Border Radius

Outer radius = inner radius + padding. Mismatched radii on nested elements is the most common thing that makes interfaces feel off.

### 2. Optical Over Geometric Alignment

When geometric centering looks off, align optically. Buttons with icons, play triangles, and asymmetric icons all need manual adjustment.

### 3. Shadows Over Borders

Layer multiple transparent `box-shadow` values for natural depth. Shadows adapt to any background; solid borders don't.

### 4. Interruptible Animations

Use CSS transitions for interactive state changes, they can be interrupted mid-animation. Reserve keyframes for staged sequences that run once.

### 5. Split and Stagger Enter Animations

Don't animate a single container. Break content into semantic chunks and stagger each with ~100ms delay.

### 6. Subtle Exit Animations

Use a small fixed `translateY` instead of full height. Exits should be softer than enters.

### 7. Contextual Icon Animations

The rest: https://github.com/kortix-ai/suna/blob/HEAD/apps/web/.agents/skills/make-interfaces-feel-better/SKILL.md