diff --git a/astro.config.ts b/astro.config.ts
index ad4a04eecf5e1..f125b73520bf4 100644
--- a/astro.config.ts
+++ b/astro.config.ts
@@ -12,14 +12,9 @@ import { starlightPluginSmokeTest } from './config/plugins/smoke-test';
 import { rehypeTasklistEnhancer } from './config/plugins/rehype-tasklist-enhancer';
 import { remarkFallbackLang } from './config/plugins/remark-fallback-lang';
 
-/* https://docs.netlify.com/configure-builds/environment-variables/#read-only-variables */
-const NETLIFY_PREVIEW_SITE = process.env.CONTEXT !== 'production' && process.env.DEPLOY_PRIME_URL;
-
-const site = NETLIFY_PREVIEW_SITE || 'https://docs.astro.build/';
-
 // https://astro.build/config
 export default defineConfig({
-	site,
+	site: 'https://docs.astro.build/',
 	integrations: [
 		devServerFileWatcher([
 			'./config/**', // Custom plugins and integrations
@@ -31,6 +26,7 @@ export default defineConfig({
 			expressiveCode: {
 				plugins: [pluginCollapsibleSections()],
 			},
+			customCss: ['./src/styles/custom.css'],
 			components: {
 				EditLink: './src/components/starlight/EditLink.astro',
 				Hero: './src/components/starlight/Hero.astro',
diff --git a/scripts/lint-linkcheck.ts b/scripts/lint-linkcheck.ts
index e5753e2c188a7..586dedbdc493d 100644
--- a/scripts/lint-linkcheck.ts
+++ b/scripts/lint-linkcheck.ts
@@ -65,7 +65,7 @@ class LinkChecker {
 
 // Use our class to check for link issues
 const linkChecker = new LinkChecker({
-	baseUrl: 'https://docs.astro.build',
+	baseUrl: 'https://v5.docs.astro.build',
 	buildOutputDir: './dist',
 	pageSourceDir: './src/content/docs',
 	checks: [
diff --git a/src/content.config.ts b/src/content.config.ts
index 0ca424130a6e6..0cc6e0a23e993 100644
--- a/src/content.config.ts
+++ b/src/content.config.ts
@@ -6,6 +6,11 @@ import { AstroDocsI18nSchema } from './content/i18n-schema';
 import { logoKeys } from './data/logos';
 
 export const baseSchema = z.object({
+	// ADD A SITE-WIDE BANNER TO SHOW THESE ARE OLD DOCS.
+	banner: z.object({ content: z.string() }).default({
+		content:
+			'This is an unmaintained snapshot of the Astro v5 docs. <a href="https://docs.astro.build/">View the latest docs.</a>',
+	}),
 	type: z.literal('base').optional().default('base'),
 	i18nReady: z.boolean().default(false),
 	githubURL: z.string().url().optional(),
diff --git a/src/content/docs/es/upgrade-astro.mdx b/src/content/docs/es/upgrade-astro.mdx
index ad6fac9033263..8f2a8e7461498 100644
--- a/src/content/docs/es/upgrade-astro.mdx
+++ b/src/content/docs/es/upgrade-astro.mdx
@@ -2,9 +2,6 @@
 title: Actualizando Astro
 description: Conoce cómo actualizar Astro 
 i18nReady: true
-banner:
-  content: | 
-    ¡Ya está aquí Astro v5! <a href="/es/guides/upgrade-to/v5/">Aprenda a actualizar su sitio web</a>
 ---
 import PackageManagerTabs from '~/components/tabs/PackageManagerTabs.astro';
 import Version from '~/components/Version.astro';
diff --git a/src/content/docs/ja/install-and-setup.mdx b/src/content/docs/ja/install-and-setup.mdx
index f22b09ceff397..08927f34ae0f8 100644
--- a/src/content/docs/ja/install-and-setup.mdx
+++ b/src/content/docs/ja/install-and-setup.mdx
@@ -2,9 +2,6 @@
 title: Astroのインストールとセットアップ
 description: 'Astroをインストールして新しいプロジェクトを開始しましょう。'
 i18nReady: true
-banner:
-  content: |
-    Astro v5 が登場! <a href="/ja/guides/upgrade-to/v5/">サイトのアップグレード方法を学ぶ</a>
 ---
 import { CardGrid, FileTree, LinkCard, Steps } from '@astrojs/starlight/components';
 import PackageManagerTabs from '~/components/tabs/PackageManagerTabs.astro';
diff --git a/src/styles/custom.css b/src/styles/custom.css
new file mode 100644
index 0000000000000..1968f79dbd069
--- /dev/null
+++ b/src/styles/custom.css
@@ -0,0 +1,4 @@
+:root {
+	--sl-color-banner-bg: var(--sl-color-orange);
+	--sl-color-banner-text: #000;
+}