[Tutorial] Apply custom theme to Swap component (#1098)

* add theme gif

* add styled swap component image

* add swap component before custom theme

* add tutorial for custom themes in OCK

apps/base-docs/tutorials/docs/1_ock-swap-theme.md

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+---
+title: 'Create a Custom Themed Swap Component with OnchainKit'
+slug: /create-custom-themed-swap-component
+description: Learn how to implement a swap component with a custom theme using OnchainKit in your React application.
+author: hughescoin
+keywords: [OnchainKit, Swap Component, Custom Theme, React, TypeScript, ERC20 Tokens, Base Chain]
+tags: ['frontend', 'defi', 'ethereum', 'base']
+difficulty: medium
+displayed_sidebar: null
+---
+
+In this tutorial, you'll learn how to create a swap component with a custom theme using OnchainKit. We'll start with the OnchainKit App Template and modify it to include a swap interface for ERC20 tokens on the Base.
+
+---
+
+## Objectives
+
+By the end of this tutorial, you should be able to:
+
+- Set up a project using the OnchainKit App Template
+- Implement a swap component for ERC20 tokens
+- Customize the theme of your OnchainKit components
+- Apply CSS overrides to fine-tune the appearance of your app
+
+## Prerequisites
+
+### React and TypeScript
+
+You should be familiar with React and TypeScript. If you're new to these technologies, consider reviewing their [official documentation](https://react.dev/) first.
+
+### OnchainKit
+
+This tutorial uses OnchainKit. Familiarity with its basic concepts will be helpful.
+
+---
+
+## Setting up the Project
+
+To get started, clone the OnchainKit App Template by running:
+
+```bash
+git clone git@github.com:coinbase/onchain-app-template.git
+```
+
+If you have an existing app that uses OnchainKit, update to the latest version:
+
+```bash
+bun update @coinbase/onchainkit --latest
+```
+
+Now let's implement the Swap component by importing it from OnchainKit. Import it into a new route of your app or, if you're following along, the `src/app/page.tsx` file:
+
+```ts
+import {
+  Swap,
+  SwapAmountInput,
+  SwapToggleButton,
+  SwapButton,
+  SwapMessage,
+  SwapToast,
+} from '@coinbase/onchainkit/swap';
+
+import type { Token } from 'node_modules/@coinbase/onchainkit/esm/token/types';
+```
+
+The `<Swap/>` component enables you to swap any ERC20 token on Base. For this example, your users will be able to swap between USDC and ETH. Next, using the `Token` type, create instances of ETH and USDC.
+
+```ts
+const ETHToken: Token = {
+  address: '',
+  chainId: 8453,
+  decimals: 18,
+  name: 'Ethereum',
+  symbol: 'ETH',
+  image:
+    'https://dynamic-assets.coinbase.com/dbb4b4983bde81309ddab83eb598358eb44375b930b94687ebe38bc22e52c3b2125258ffb8477a5ef22e33d6bd72e32a506c391caa13af64c00e46613c3e5806/asset_icons/4113b082d21cc5fab17fc8f2d19fb996165bcce635e6900f7fc2d57c4ef33ae9.png',
+};
+
+const USDCToken: Token = {
+  address: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913',
+  chainId: 8453,
+  decimals: 6,
+  name: 'USDC',
+  symbol: 'USDC',
+  image:
+    'https://dynamic-assets.coinbase.com/3c15df5e2ac7d4abbe9499ed9335041f00c620f28e8de2f93474a9f432058742cdf4674bd43f309e69778a26969372310135be97eb183d91c492154176d455b8/asset_icons/9d67b728b6c8f457717154b3a35f9ddc702eae7e76c4684ee39302c4d7fd0bb8.png',
+};
+```
+
+![swap-component-default](../../assets/images/onchainkit-tutorials/swapped-theme-before.png)
+
+Here's a [sample](https://gist.github.com/hughescoin/4558feabb4f40b51f800091f04a945ae) of the full `page.tsx` file for reference.
+
+## Changing the Theme
+
+To change the theme of the site, navigate to `src/components/OnchainProviders.tsx` and add a `config` object to the `OnchainKitProvider`. This is the first step in enabling Themes for your project.
+
+```js
+config={{
+    appearance: {
+        mode: 'auto', // 'auto' | 'light' | 'dark'
+        theme: 'default', // 'default' | 'base' | 'cyberpunk' | 'hacker'
+    },
+}}
+```
+
+OnchainKit provides you with four preset themes. We'll use the "hacker" theme for its fonts but change the colors to a different palette.
+
+If you need help coming up with a color palette, there are many online tools available. For example, I used [color magic](https://colormagic.app).
+
+## Customizing the CSS
+
+Once you've chosen your colors, add them to the CSS file. Update the `src/app/global.css` file to include CSS overrides for OnchainKit properties. In the sample below, the comments provide guidance on which properties will change color.
+
+:::tip Having trouble changing an element?
+
+Use the "Inspect" feature in your browser to identify the element you wish to override in your `global.css` file.
+
+![Inspect Element GIF](../../assets/images/onchainkit-tutorials/inspect-ock-theme.gif)
+
+:::
+
+```css
+@layer base {
+  :root,
+  .default-light,
+  .default-dark,
+  .base,
+  .cyberpunk,
+  .hacker {
+    /* Text colors */
+    --ock-text-inverse: #f1d579;
+    --ock-text-foreground: #8c3e21;
+    --ock-text-foreground-muted: #f1d579;
+    --ock-text-error: #c85c2d;
+    --ock-text-primary: #e1a04c;
+    --ock-text-success: #f5b370;
+    --ock-text-warning: #f1d579;
+    --ock-text-disabled: #8c3e21;
+
+    /* Background colors */
+    --ock-bg-default: #8c3e21;
+    --ock-bg-default-hover: #c85c2d;
+    --ock-bg-default-active: #f1d579;
+    --ock-bg-alternate: #f1d579;
+    --ock-bg-alternate-hover: #e1a04c;
+    --ock-bg-alternate-active: #c85c2d;
+    --ock-bg-inverse: #c85c2d;
+    --ock-bg-inverse-hover: #e1a04c;
+    --ock-bg-inverse-active: #f5b370;
+    --ock-bg-primary: #c85c2d;
+    --ock-bg-primary-hover: #e1a04c;
+    --ock-bg-primary-active: #f1d579;
+    --ock-bg-primary-washed: #f5b370;
+    --ock-bg-primary-disabled: #8c3e21;
+    --ock-bg-secondary: #e1a04c;
+    --ock-bg-secondary-hover: #f1d579;
+    --ock-bg-secondary-active: #f5b370;
+    --ock-bg-error: #c85c2d;
+    --ock-bg-warning: #f1d579;
+    --ock-bg-success: #f5b370;
+    --ock-bg-default-reverse: #c85c2d;
+
+    /* Icon colors */
+    --ock-icon-color-primary: #c85c2d;
+    --ock-icon-color-foreground: #c85c2d;
+    --ock-icon-color-foreground-muted: #e1a04c;
+    --ock-icon-color-inverse: #f5b370;
+    --ock-icon-color-error: #c85c2d;
+    --ock-icon-color-success: #f5b370;
+    --ock-icon-color-warning: #f1d579;
+
+    /* Line colors */
+    --ock-line-primary: #c85c2d;
+    --ock-line-default: #8c3e21;
+    --ock-line-heavy: #f1d579;
+    --ock-line-inverse: #e1a04c;
+  }
+}
+
+.ock-font-family.font-semibold.text-xl.leading-7 {
+  color: #f1d579;
+}
+```
+
+Now refresh your page, and you should see your swap component change to your defined color palette!
+
+![swap-component](../../assets/images/onchainkit-tutorials/swapped-theme-final.png)
+
+If something looks off, remember to check that you've overridden the correct element. See the above tip to learn how to find the correct element.
+
+## Conclusion
+
+Congratulations! You've successfully implemented the `<Swap/>` component and customized it to a theme of your choice. Pretty neat, right?
+
+[OnchainKit App Template]: https://github.com/coinbase/onchain-app-template
+[color magic]: https://colormagic.app
+[sample]: https://gist.github.com/hughescoin/4558feabb4f40b51f800091f04a945ae