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Clerk Blog

Going to production with Clerk Deploy Clerk Init: The fastest way to start a new project Introducing Clerk CLI Middleware-based route protection bypass Postmortem: Clerk System Outage (March 10, 2026) Clerk for the AI era Add API Key support to your SaaS in minutes Postmortem: Clerk System Outage (February 19, 2026) Using Clerk in a React Native app Postmortem: DNS Provider Outage (February 10, 2026) How do I implement passkeys in Next.js? Clerk ranked #4 fastest-growing software vendor on Ramp’s December 2025 list How do I handle JWT verification in Next.js? Committing to Agent Identity: Clerk raises $50m Series C from Menlo and Anthropic’s Anthology Fund What is the best way to handle authentication in Next.js App Router? Postmortem: Database Incident (September 14–18, 2025) How do I add authentication to a Next.js app? Introducing Free Trials in Clerk Billing Postmortem: August 28, 2025 - elevated API latency and errors Introducing Mosaic: Bring Your Brand to Every Authentication Flow Multi-tenant authentication: What you need to know (and how Clerk helps) What are the risks and challenges of multi-tenancy? Resilience in Practice: Regional Failover at Clerk Build a Cross-Platform B2B App with Clerk, Expo, and Supabase Highlights from the MiduDev/Clerk Hackathon Add multi-tenancy to an app built with Clerk, Lovable, and Supabase How to build an AI coding rules app with Clerk, Lovable, and Supabase How to Build Multi-Tenant Authentication with Clerk Choosing the right SaaS architecture: Multi-Tenant vs. Single-Tenant Postmortem: June 26, 2025 service outage How to Design a Multi-Tenant SaaS Architecture What is multi-tenancy and why it matters for B2B SaaS How OAuth Works Synchronize user data from Clerk to Supabase Add subscriptions to your SaaS with Clerk Billing Getting started with Clerk Billing Multi-tenant analytics with Tinybird and Clerk How Huntr Migrated 250K Users to Clerk: A Scalable Auth Solution for Startups How to take Clerk to Production How to take your Clerk application to production A practical guide to testing Clerk Next.js applications Implementing multi-tenancy into a Supabase app with Clerk How Clerk integrates with a Next.js application using Supabase How Clerk integrates with Supabase Build a blog with tRPC, Prisma, Next.js and Clerk How to enrich PostHog events with Clerk user data How to build a secure project management platform with Next.js, Clerk, and Neon Validate your SaaS idea while building an audience Postmortem: February 6, 2025 service outage Implement Role-Based Access Control in Next.js 15 Build a Next.js sign-up form with React Hook Form Build a Next.js login page template How to implement Google authentication in Next.js 15 What is middleware in Next.js? How to customize Next.js metadata How to set environment variables in Node.js Building a React Login Page Template How to implement per-user OAuth scopes with Clerk Using Clerk SSO to access Google Calendar and other service data Streamline enterprise customer onboarding with SAML and Clerk Clerk launches EASIE SSO and eliminates SSO fees How to secure Liveblocks Rooms with Clerk in Next.js Securing Node.js Express APIs with Clerk and React Combining the benefits of session tokens and JWTs Build a task manager with Next.js, Supabase, and Clerk Comparing Clerk Webhooks vs Backend API Automate Neon schema changes with Drizzle and GitHub Actions A guide to reading authenticated user data from Clerk Role based access control with Clerk Organizations Mitigating OAuth’s recently discovered Open Response Type vulnerability Per-user B2B monetization with Stripe and Clerk Organizations Build a team-based task manager with Next.js, Neon, and Clerk Building a Hybrid Sign-Up/Subscribe Form with Stripe Elements Welcoming Colin from Zod as our inaugural Open Source Fellow Build a modern authenticated chat application with Next.js, Ably, and Clerk Build a waitlist with Clerk user metadata How to use Clerk with PostHog Identify in Next.js How to secure API Gateway using JWT and Lambda Authorizers with Clerk What are passkeys and how do they work? Comparing Authentication in React.js vs. Next.js How to Add an Onboarding Flow for your Application with Clerk Create Your Own Custom User Menu with Radix - Part 2 Introducing Webhook Workflows with Inngest & Svix Clerk raises $30M Series B from CRV and Stripe Clerk in 2023: A Year in Review Build a Movie Emoji Quiz App with Remix, Fauna, and Clerk Ultimate Guide to Magic Link Authentication Create Your Own Custom User Menu with Radix Introducing has(), protect(), and <Protect> Updated Pricing: 10,000 MAUs Free, and a new “Pro Plan” Next.js Authentication with Clerk: Streamlined SSR Handling Clerk Webhooks: Data Sync with Convex Exploring Clerk Metadata with Stripe Webhooks The Ultimate Guide to Next.js Authentication Empower Your Support Team With User Impersonation Clerk Webhooks: Getting Started A Complete Guide to Session Management in Next.js The Advanced Guide to Passwordless Authentication in Next.js How We Roll – Chapter 10: Roundup How We Roll – Chapter 9: Infrastructure
How We Roll – Chapter 5: Customization
James Perkins · 2023-06-17 · via Clerk Blog

Welcome to How We Roll! This series is meant to help product owners, developers, and security professionals understand exactly how we implement (or, roll) authentication at Clerk.

Chapter 5: Customization

When you build your brand, you spend hours making sure every color, font, and logo is exactly how you envisioned. When you integrate with a 3rd party product like Clerk, you want to make sure that your brand shines. Clerk empowers developers by offering:

  • Highly customizable components
  • Custom flows
  • Themes for our hosted pages

In this chapter we are going to be talking about how to customize our drop-in components and why we wanted to treat it as a first class experience. Grab a drink and enjoy a deep dive into our appearance property.

Clerk’s Appearance Property

When Clerk introduced customization, we wanted something that wasn’t an afterthought where only minimal items could be changed, like buttons or primary colors. We wanted developers to go as deep as required, and the appearance property allowed this by letting developers:

  • Have access to entire themes, like dark mode, and the ability to create a custom theme
  • Control the layout
  • Have global control of the appearance
  • Customize individual components
  • Inherit from key branding like fonts, and element sizing
  • Integrate with their current CSS method of choice

Base Themes

The baseTheme allows a developer to create a theme for your brand, and can be reused across multiple projects. We provide a package called @clerk/themes that allows you to use prebuilt versions that were crafted by Clerk, like our dark theme or shades of purple:

How We Roll Customization guide illustration

Controlling the Layout

The default layouts for Clerk’s sign in and sign up components show the social buttons at the top, with other forms of authentication, like email, below. In similar fashion, when a user signs up for your application, by default, we show the optional fields. For some applications this makes sense, for others, not so much.

This is where our layout property can be used. Developers can move social providers, change the default look of the social buttons, hide optional fields, show links to help, privacy policy, and terms and conditions pages, and much more:

How We Roll Customization guide illustration

Global Customization

Not every application needs its own theme; it is possible to extend the Clerk baseTheme to fit with an application. Examples include globally setting some of the attributes, such as every primaryButton element having a green background and the text inside being yellow, or setting all text colors to the company’s brand color.

All of this can be done at the ClerkProvider level, allowing developers to speed up the customization of our components:

How We Roll Customization guide illustration

Individual Components

Applications are built of components, and individual components may need to be styled in a specific way. For example the Clerk <UserButton /> might be too small for your sidebar or navigation bar, or the <UserProfile/> may not need to show the sidebar.

You can apply the appearance property directly to individual Clerk components:

How We Roll Customization guide illustration

Elements and Variables

We’ve talked a lot about the parts that make Clerk customization a first class experience, but the powerful parts are variables and elements. Whether you are globally styling or styling individual components, variables and elements are essential.

The variables property is used to adjust the general styles of the base theme, like colors, backgrounds, typography:

The elements property is used for fine-grained theme overrides, and is useful when styling specific HTML elements. You can find the element to target by inspecting the HTML and looking for the class name.

Summary

Clerk allows for extensive customization when integrating with third-party products, ensuring brand elements are upheld. Developers can customize individual components, control the layout, modify the global appearance, create custom themes, and adjust the style of base themes through the appearance, baseTheme, layout, variables, and elements properties, ensuring the brand's unique design and user experience are reflected in every interaction.

For an in-depth look at how to leverage the full power of customization with Clerk, check out the Component Customization docs.

How We Roll Series Index