diff --git a/canon-docs/package.json b/canon-docs/package.json
index 824a645f99..9fddf08c20 100644
--- a/canon-docs/package.json
+++ b/canon-docs/package.json
@@ -9,11 +9,15 @@
     "watch-css": "node scripts/watch-css.js"
   },
   "dependencies": {
+    "@codemirror/lang-sass": "^6.0.2",
+    "@lezer/highlight": "^1.2.1",
     "@mdx-js/loader": "^3.1.0",
     "@mdx-js/react": "^3.1.0",
     "@next/mdx": "^15.1.4",
     "@storybook/react": "^8.4.7",
     "@types/mdx": "^2.0.13",
+    "@uiw/codemirror-themes": "^4.23.7",
+    "@uiw/react-codemirror": "^4.23.7",
     "next": "14.2.23",
     "react": "^18",
     "react-dom": "^18",
diff --git a/canon-docs/src/app/globals.css b/canon-docs/src/app/globals.css
index 4b39735a22..5efc0407e7 100644
--- a/canon-docs/src/app/globals.css
+++ b/canon-docs/src/app/globals.css
@@ -35,3 +35,37 @@ iframe {
   font-weight: var(--shiki-dark-font-weight) !important;
   text-decoration: var(--shiki-dark-text-decoration) !important;
 }
+
+.cm-editor {
+  transition: background-color 0.2s ease-in-out;
+}
+
+.ͼ2 .cm-gutters {
+  background-color: var(--canon-surface-2);
+  border-right: 1px solid var(--canon-border-base);
+  transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out;
+}
+
+.ͼ1 .cm-lineNumbers .cm-gutterElement {
+  padding-right: 8px;
+  padding-left: 8px;
+  font-size: 0.875rem;
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  min-width: 34px;
+}
+
+.cm-line {
+  font-size: 0.875rem;
+}
+
+.ͼ1 .cm-line {
+  padding-left: 12px;
+  padding-top: 1px;
+  padding-bottom: 1px;
+}
+
+.cm-focused {
+  outline: none !important;
+}
diff --git a/canon-docs/src/app/layout.tsx b/canon-docs/src/app/layout.tsx
index 6eb1856a1d..99b5f22739 100644
--- a/canon-docs/src/app/layout.tsx
+++ b/canon-docs/src/app/layout.tsx
@@ -2,7 +2,7 @@ import type { Metadata } from 'next';
 import { Sidebar } from '../components/Sidebar';
 import { Toolbar } from '@/components/Toolbar';
 import { Providers } from './providers';
-
+import { CustomTheme } from '@/components/CustomTheme';
 import styles from './page.module.css';
 
 import './globals.css';
@@ -13,6 +13,7 @@ import '/public/backstage.css';
 export const metadata: Metadata = {
   title: 'Canon',
   description: 'UI library for Backstage',
+  metadataBase: new URL('https://canon.backstage.io'),
 };
 
 export default function RootLayout({
@@ -35,6 +36,7 @@ export default function RootLayout({
               <Toolbar />
               {children}
             </div>
+            <CustomTheme />
           </div>
         </Providers>
       </body>
diff --git a/canon-docs/src/components/CustomTheme/customTheme.tsx b/canon-docs/src/components/CustomTheme/customTheme.tsx
new file mode 100644
index 0000000000..3d8ed394bd
--- /dev/null
+++ b/canon-docs/src/components/CustomTheme/customTheme.tsx
@@ -0,0 +1,147 @@
+'use client';
+
+import { useEffect, useState, useCallback } from 'react';
+import CodeMirror from '@uiw/react-codemirror';
+import { sass } from '@codemirror/lang-sass';
+import styles from './styles.module.css';
+import { usePlayground } from '@/utils/playground-context';
+import { AnimatePresence, motion } from 'framer-motion';
+import { Icon } from '../../../../packages/canon';
+import { createTheme } from '@uiw/codemirror-themes';
+import { tags as t } from '@lezer/highlight';
+
+const defaultTheme = `:root {
+  --canon-accent: #000;
+}`;
+
+const myTheme = createTheme({
+  theme: 'light',
+  settings: {
+    background: 'var(--canon-surface-1)',
+    backgroundImage: '',
+    foreground: '#6182B8',
+    caret: '#5d00ff',
+    selection: '#036dd626',
+    selectionMatch: '#036dd626',
+    lineHighlight: '#8a91991a',
+    gutterBackground: '#fff',
+    gutterForeground: '#8a919966',
+  },
+  styles: [
+    { tag: t.comment, color: '#787b8099' },
+    { tag: t.variableName, color: '#0080ff' },
+    { tag: [t.string, t.special(t.brace)], color: '#6182B8' },
+    { tag: t.number, color: '#6182B8' },
+    { tag: t.bool, color: '#6182B8' },
+    { tag: t.null, color: '#6182B8' },
+    { tag: t.keyword, color: '#6182B8' },
+    { tag: t.operator, color: '#6182B8' },
+    { tag: t.className, color: '#6182B8' },
+    { tag: t.definition(t.typeName), color: '#6182B8' },
+    { tag: t.typeName, color: '#6182B8' },
+    { tag: t.angleBracket, color: '#6182B8' },
+    { tag: t.tagName, color: '#6182B8' },
+    { tag: t.attributeName, color: '#6182B8' },
+  ],
+});
+
+export const CustomTheme = () => {
+  const [isClient, setIsClient] = useState(false);
+  const [open, setOpen] = useState(true);
+  const [customTheme, setCustomTheme] = useState<string | undefined>(undefined);
+  const { selectedThemeName } = usePlayground();
+  const [savedMessage, setSavedMessage] = useState<string>('Save');
+
+  const updateStyleElement = (theme: string) => {
+    let styleElement = document.getElementById(
+      'custom-theme-style',
+    ) as HTMLStyleElement;
+
+    if (!styleElement) {
+      styleElement = document.createElement('style');
+      styleElement.id = 'custom-theme-style';
+      document.head.appendChild(styleElement);
+    }
+
+    styleElement.textContent = theme;
+  };
+
+  useEffect(() => {
+    if (selectedThemeName === 'custom') {
+      let storedTheme = localStorage.getItem('customThemeCss');
+      if (!storedTheme) {
+        storedTheme = defaultTheme;
+        localStorage.setItem('customThemeCss', storedTheme);
+      }
+      setCustomTheme(storedTheme);
+      updateStyleElement(storedTheme);
+    } else {
+      const styleElement = document.getElementById(
+        'custom-theme-style',
+      ) as HTMLStyleElement;
+      if (styleElement) {
+        styleElement.remove();
+      }
+    }
+  }, [selectedThemeName]);
+
+  useEffect(() => {
+    setIsClient(true);
+  }, []);
+
+  const handleSave = () => {
+    if (customTheme) {
+      localStorage.setItem('customThemeCss', customTheme);
+      updateStyleElement(customTheme);
+      setSavedMessage('Saved!');
+      setTimeout(() => setSavedMessage('Save'), 1000);
+    }
+  };
+
+  const handleChange = useCallback((val: string) => {
+    setCustomTheme(val);
+  }, []);
+
+  if (isClient === false) return null;
+
+  return (
+    <AnimatePresence>
+      {selectedThemeName === 'custom' && (
+        <motion.div
+          className={`${styles.container} ${open ? styles.open : ''}`}
+          initial={{ opacity: 0, y: 10 }}
+          animate={{ opacity: 1, y: 0 }}
+          exit={{ opacity: 0, y: 10 }}
+        >
+          <div className={styles.header}>
+            <div className={styles.headerLeft}>Custom Theme</div>
+            <div className={styles.headerRight}>
+              {open && (
+                <button className={styles.buttonSave} onClick={handleSave}>
+                  {savedMessage}
+                </button>
+              )}
+              <button
+                className={styles.buttonClose}
+                onClick={() => setOpen(!open)}
+              >
+                <Icon name={open ? 'chevronDown' : 'chevronUp'} />
+              </button>
+            </div>
+          </div>
+          <div className={styles.editorContainer}>
+            <CodeMirror
+              value={customTheme}
+              height="300px"
+              extensions={[sass()]}
+              onChange={handleChange}
+              className={styles.editor}
+              basicSetup={{ foldGutter: false }}
+              theme={myTheme}
+            />
+          </div>
+        </motion.div>
+      )}
+    </AnimatePresence>
+  );
+};
diff --git a/canon-docs/src/components/CustomTheme/index.ts b/canon-docs/src/components/CustomTheme/index.ts
new file mode 100644
index 0000000000..6805b2c087
--- /dev/null
+++ b/canon-docs/src/components/CustomTheme/index.ts
@@ -0,0 +1 @@
+export { CustomTheme } from './customTheme';
diff --git a/canon-docs/src/components/CustomTheme/styles.module.css b/canon-docs/src/components/CustomTheme/styles.module.css
new file mode 100644
index 0000000000..a4f51c8a1d
--- /dev/null
+++ b/canon-docs/src/components/CustomTheme/styles.module.css
@@ -0,0 +1,77 @@
+.container {
+  position: fixed;
+  bottom: 16px;
+  right: 16px;
+  width: 240px;
+  height: 47px;
+  background-color: var(--canon-surface-1);
+  border-radius: 0.375rem;
+  border: 1px solid var(--canon-border-base);
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+  transition-property: background-color, border-color, height, width;
+  transition-duration: 0.2s;
+  transition-timing-function: ease-in-out;
+}
+
+.open {
+  width: 36%;
+  height: 348px;
+}
+
+.editor {
+  flex: 1;
+}
+
+.editorContainer {
+  overflow: hidden;
+}
+
+.header {
+  height: 46px;
+  flex-shrink: 0;
+  border-bottom: 1px solid var(--canon-border-base);
+  background-color: var(--canon-surface-1);
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 0 12px 0 16px;
+  transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out;
+}
+
+.headerLeft {
+  font-size: 0.875rem;
+}
+
+.headerRight {
+  display: flex;
+  gap: 8px;
+}
+
+.buttonSave {
+  all: unset;
+  height: 28px;
+  padding: 0 8px;
+  color: #fff;
+  background-color: #000;
+  border-radius: 0.25rem;
+  cursor: pointer;
+  font-size: 0.75rem;
+}
+
+.buttonClose {
+  all: unset;
+  height: 28px;
+  padding: 0 8px;
+  color: #fff;
+  background-color: var(--canon-surface-2);
+  color: var(--canon-text-primary);
+  transition: background-color 0.2s ease-in-out;
+  border-radius: 0.25rem;
+  cursor: pointer;
+  font-size: 0.875rem;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
diff --git a/canon-docs/src/components/Sidebar/Sidebar.module.css b/canon-docs/src/components/Sidebar/Sidebar.module.css
index 870f504d28..f3bdd3f2e7 100644
--- a/canon-docs/src/components/Sidebar/Sidebar.module.css
+++ b/canon-docs/src/components/Sidebar/Sidebar.module.css
@@ -35,15 +35,11 @@
   position: relative;
 }
 
-.menu a {
-  display: flex;
-  text-decoration: none;
-  height: 28px;
-  align-items: center;
-}
-
 .section {
   width: 100%;
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
 }
 
 .sectionTitle {
@@ -54,12 +50,14 @@
 }
 
 .line {
+  text-decoration: none;
+  align-items: center;
   width: 100%;
   display: flex;
   flex-direction: row;
   justify-content: space-between;
   align-items: center;
-  height: 28px;
+  height: 26px;
   padding: 0 12px;
   border-radius: 4px;
   transition: background-color 0.2s ease-in-out;
diff --git a/canon-docs/src/components/Sidebar/docs.tsx b/canon-docs/src/components/Sidebar/docs.tsx
index 13c1675c20..f207036cfa 100644
--- a/canon-docs/src/components/Sidebar/docs.tsx
+++ b/canon-docs/src/components/Sidebar/docs.tsx
@@ -2,8 +2,7 @@
 
 import Link from 'next/link';
 import { components, overview, layoutComponents, theme } from '@/utils/data';
-import { Box } from '../../../../packages/canon/src/components/Box';
-import { Text } from '../../../../packages/canon/src/components/Text';
+import { Box } from '../../../../packages/canon';
 import { motion } from 'framer-motion';
 import styles from './Sidebar.module.css';
 import { usePathname } from 'next/navigation';
diff --git a/canon-docs/src/components/Toolbar/theme-name.module.css b/canon-docs/src/components/Toolbar/theme-name.module.css
index 6f2ceb427f..c9700c571b 100644
--- a/canon-docs/src/components/Toolbar/theme-name.module.css
+++ b/canon-docs/src/components/Toolbar/theme-name.module.css
@@ -43,7 +43,7 @@
   box-sizing: border-box;
   padding-block: 0.25rem;
   border-radius: 0.375rem;
-  background-color: canvas;
+  background-color: var(--canon-surface-1);
   color: var(--color-gray-900);
   border: 1px solid var(--canon-border-base);
   padding-inline: 0.25rem;
diff --git a/canon-docs/src/components/Toolbar/theme-name.tsx b/canon-docs/src/components/Toolbar/theme-name.tsx
index 57c858dd44..07b734de34 100644
--- a/canon-docs/src/components/Toolbar/theme-name.tsx
+++ b/canon-docs/src/components/Toolbar/theme-name.tsx
@@ -6,8 +6,9 @@ import { Icon } from '@backstage/canon';
 import { usePlayground } from '@/utils/playground-context';
 
 const themes = [
-  { name: 'Backstage Legacy', value: 'legacy' },
   { name: 'Backstage Default', value: 'default' },
+  { name: 'Backstage Legacy', value: 'legacy' },
+  { name: 'Custom theme', value: 'custom' },
 ];
 
 export const ThemeNameSelector = () => {
@@ -31,7 +32,7 @@ export const ThemeNameSelector = () => {
         <Select.Positioner className={styles.Positioner} sideOffset={8}>
           <Select.Popup className={styles.Popup}>
             {themes.map(({ name, value }) => (
-              <Select.Item className={styles.Item} value={value}>
+              <Select.Item className={styles.Item} value={value} key={value}>
                 <Select.ItemIndicator className={styles.ItemIndicator}>
                   <Icon name="check" />
                 </Select.ItemIndicator>
diff --git a/canon-docs/src/mdx-components.tsx b/canon-docs/src/mdx-components.tsx
index 59eee5e18f..eec8eec438 100644
--- a/canon-docs/src/mdx-components.tsx
+++ b/canon-docs/src/mdx-components.tsx
@@ -2,7 +2,6 @@ import React, { ReactNode } from 'react';
 import type { MDXComponents } from 'mdx/types';
 import Image, { ImageProps } from 'next/image';
 import { CodeBlock } from '@/components/CodeBlock';
-import { Heading } from '../../packages/canon/src/components/Heading';
 import { Box } from '../../packages/canon/src/components/Box';
 
 export function useMDXComponents(components: MDXComponents): MDXComponents {
diff --git a/canon-docs/src/utils/playground-context.tsx b/canon-docs/src/utils/playground-context.tsx
index 198c5a9aab..721851c3e4 100644
--- a/canon-docs/src/utils/playground-context.tsx
+++ b/canon-docs/src/utils/playground-context.tsx
@@ -7,16 +7,19 @@ import React, {
 } from 'react';
 import { components } from './data';
 
+type Theme = 'light' | 'dark';
+type ThemeName = 'legacy' | 'default' | 'custom';
+
 // Create a context with an empty array as the default value
 const PlaygroundContext = createContext<{
   selectedScreenSizes: string[];
   setSelectedScreenSizes: (screenSizes: string[]) => void;
   selectedComponents: string[];
   setSelectedComponents: (components: string[]) => void;
-  selectedTheme: string | null;
-  setSelectedTheme: (theme: string) => void;
-  selectedThemeName: string;
-  setSelectedThemeName: (themeName: string) => void;
+  selectedTheme: Theme;
+  setSelectedTheme: (theme: Theme) => void;
+  selectedThemeName: ThemeName;
+  setSelectedThemeName: (themeName: ThemeName) => void;
 }>({
   selectedScreenSizes: [],
   setSelectedScreenSizes: () => {},
@@ -37,12 +40,14 @@ export const PlaygroundProvider = ({ children }: { children: ReactNode }) => {
   const [selectedComponents, setSelectedComponents] = useState<string[]>(
     components.map(component => component.slug),
   );
-  const [selectedTheme, setSelectedTheme] = useState<string | null>(() => {
-    return isBrowser ? localStorage.getItem('theme') : 'light';
-  });
-  const [selectedThemeName, setSelectedThemeName] = useState<string>(() => {
+  const [selectedTheme, setSelectedTheme] = useState<Theme>(() => {
     return isBrowser
-      ? localStorage.getItem('theme-name') || 'default'
+      ? (localStorage.getItem('theme') as Theme) || 'light'
+      : 'light';
+  });
+  const [selectedThemeName, setSelectedThemeName] = useState<ThemeName>(() => {
+    return isBrowser
+      ? (localStorage.getItem('theme-name') as ThemeName) || 'default'
       : 'default';
   });
 
diff --git a/canon-docs/yarn.lock b/canon-docs/yarn.lock
index fd0b1f8742..e8b236002c 100644
--- a/canon-docs/yarn.lock
+++ b/canon-docs/yarn.lock
@@ -5,6 +5,133 @@ __metadata:
   version: 6
   cacheKey: 8
 
+"@babel/runtime@npm:^7.18.6":
+  version: 7.26.0
+  resolution: "@babel/runtime@npm:7.26.0"
+  dependencies:
+    regenerator-runtime: ^0.14.0
+  checksum: c8e2c0504ab271b3467a261a8f119bf2603eb857a0d71e37791f4e3fae00f681365073cc79f141ddaa90c6077c60ba56448004ad5429d07ac73532be9f7cf28a
+  languageName: node
+  linkType: hard
+
+"@codemirror/autocomplete@npm:^6.0.0":
+  version: 6.18.4
+  resolution: "@codemirror/autocomplete@npm:6.18.4"
+  dependencies:
+    "@codemirror/language": ^6.0.0
+    "@codemirror/state": ^6.0.0
+    "@codemirror/view": ^6.17.0
+    "@lezer/common": ^1.0.0
+  checksum: 4216f45a17f6cfd8d33df53f940396f7d3707662570bf3a79d8d333f926e273a265fac13c362e29e3fa57ccdf444f1a047862f5f56c672cfc669c87ee975858f
+  languageName: node
+  linkType: hard
+
+"@codemirror/commands@npm:^6.0.0, @codemirror/commands@npm:^6.1.0":
+  version: 6.8.0
+  resolution: "@codemirror/commands@npm:6.8.0"
+  dependencies:
+    "@codemirror/language": ^6.0.0
+    "@codemirror/state": ^6.4.0
+    "@codemirror/view": ^6.27.0
+    "@lezer/common": ^1.1.0
+  checksum: 7d819bab4830ec7b8c5dffdec4b035dfa664bfd1d2675e639e08a459df65f45be111e1b8b569b1a8a3253d5980cf2ecf4394d8a13509996cca1b65cc16d47a4e
+  languageName: node
+  linkType: hard
+
+"@codemirror/lang-css@npm:^6.2.0":
+  version: 6.3.1
+  resolution: "@codemirror/lang-css@npm:6.3.1"
+  dependencies:
+    "@codemirror/autocomplete": ^6.0.0
+    "@codemirror/language": ^6.0.0
+    "@codemirror/state": ^6.0.0
+    "@lezer/common": ^1.0.2
+    "@lezer/css": ^1.1.7
+  checksum: ed175d75d75bc0a059d1e60b3dcd8464d570da14fc97388439943c9c43e1e9146e37b83fe2ccaad9cd387420b7b411ea1d24ede78ecd1f2045a38acbb4dd36bc
+  languageName: node
+  linkType: hard
+
+"@codemirror/lang-sass@npm:^6.0.2":
+  version: 6.0.2
+  resolution: "@codemirror/lang-sass@npm:6.0.2"
+  dependencies:
+    "@codemirror/lang-css": ^6.2.0
+    "@codemirror/language": ^6.0.0
+    "@codemirror/state": ^6.0.0
+    "@lezer/common": ^1.0.2
+    "@lezer/sass": ^1.0.0
+  checksum: e7665aaab70476a952522b143fd7bd59f6c025746cbf7b542f6965f94eecac483b4afd03f6da98aaa1572e379194309b241c5264eff05c681c637aa26651b9ab
+  languageName: node
+  linkType: hard
+
+"@codemirror/language@npm:^6.0.0":
+  version: 6.10.8
+  resolution: "@codemirror/language@npm:6.10.8"
+  dependencies:
+    "@codemirror/state": ^6.0.0
+    "@codemirror/view": ^6.23.0
+    "@lezer/common": ^1.1.0
+    "@lezer/highlight": ^1.0.0
+    "@lezer/lr": ^1.0.0
+    style-mod: ^4.0.0
+  checksum: 679b69d69faa94f028f996a7005d0c6c2a2e4cd7a7a2614f615c23d7b642c31fc1837915248e864cb1ad59a2f032d1a7a8ef486b5f9904e5f6fbe6f7d2882c38
+  languageName: node
+  linkType: hard
+
+"@codemirror/lint@npm:^6.0.0":
+  version: 6.8.4
+  resolution: "@codemirror/lint@npm:6.8.4"
+  dependencies:
+    "@codemirror/state": ^6.0.0
+    "@codemirror/view": ^6.35.0
+    crelt: ^1.0.5
+  checksum: 640e3dd44eb167d952eb5c5b8518919ba46e164aa3471776342f7f9361e676b4627a76a9f01d51b22127b97413f2bc9b8c60299d8dfdd5fc8ad0225d42de7669
+  languageName: node
+  linkType: hard
+
+"@codemirror/search@npm:^6.0.0":
+  version: 6.5.8
+  resolution: "@codemirror/search@npm:6.5.8"
+  dependencies:
+    "@codemirror/state": ^6.0.0
+    "@codemirror/view": ^6.0.0
+    crelt: ^1.0.5
+  checksum: 0f9633037492a7b647b606c30255ea42c4327319e643be7ea3aa2913ed8e4aa662589f457e376636521c7d4d1215fae0e8939f127db9c0790b19ae3b654c3bc4
+  languageName: node
+  linkType: hard
+
+"@codemirror/state@npm:^6.0.0, @codemirror/state@npm:^6.1.1, @codemirror/state@npm:^6.4.0, @codemirror/state@npm:^6.5.0":
+  version: 6.5.1
+  resolution: "@codemirror/state@npm:6.5.1"
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