diff --git a/common/changes/@typespec/html-program-viewer/feature-themable-html-program-viewer_2023-11-09-20-22.json b/common/changes/@typespec/html-program-viewer/feature-themable-html-program-viewer_2023-11-09-20-22.json
new file mode 100644
index 0000000000..076b3e344f
--- /dev/null
+++ b/common/changes/@typespec/html-program-viewer/feature-themable-html-program-viewer_2023-11-09-20-22.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/html-program-viewer",
+      "comment": "Add ability to change colors of the program viewer using css variables. A `ColorProvider` component is also provided for convenience.",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/html-program-viewer"
+}
diff --git a/common/changes/@typespec/playground/feature-themable-html-program-viewer_2023-11-09-20-22.json b/common/changes/@typespec/playground/feature-themable-html-program-viewer_2023-11-09-20-22.json
new file mode 100644
index 0000000000..3007c546a8
--- /dev/null
+++ b/common/changes/@typespec/playground/feature-themable-html-program-viewer_2023-11-09-20-22.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/playground",
+      "comment": "Configure the program viewer to respect the color theme",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/playground"
+}
\ No newline at end of file
diff --git a/packages/html-program-viewer/src/color-provider.tsx b/packages/html-program-viewer/src/color-provider.tsx
new file mode 100644
index 0000000000..8cc881cd8f
--- /dev/null
+++ b/packages/html-program-viewer/src/color-provider.tsx
@@ -0,0 +1,19 @@
+import { FunctionComponent, ReactNode, useMemo } from "react";
+import { ColorPalette, ColorVariable, ColorsVariables } from "./constants.js";
+
+export interface ColorProviderProps {
+  colors: Partial<ColorPalette>;
+  children?: ReactNode;
+}
+
+export const ColorProvider: FunctionComponent<ColorProviderProps> = ({ children, colors }) => {
+  const cssVariables = useMemo(() => {
+    const colorArray: [ColorVariable, string][] = Object.entries(colors) as any;
+    return Object.fromEntries(
+      colorArray.map(([key, value]) => {
+        return [ColorsVariables[key], value];
+      })
+    );
+  }, [colors]);
+  return <div style={cssVariables}>{children}</div>;
+};
diff --git a/packages/html-program-viewer/src/common.tsx b/packages/html-program-viewer/src/common.tsx
index a3f86fa4f2..b0c5cc8f6d 100644
--- a/packages/html-program-viewer/src/common.tsx
+++ b/packages/html-program-viewer/src/common.tsx
@@ -1,46 +1,8 @@
-import { css } from "@emotion/react";
-import { FunctionComponent, PropsWithChildren, ReactElement } from "react";
+import { FunctionComponent, ReactElement } from "react";
 import { Colors } from "./constants.js";
 
-export interface ItemProps {
-  title: string;
-  id?: string;
-  hide?: boolean;
-}
-
-const ItemStyles = css({
-  border: "1px solid #c5c5c5",
-});
-
-const ItemTitleStyles = css({
-  border: "1px solid #c5c5c5",
-  backgroundColor: "#dedede",
-  padding: "2px 5px",
-});
-
-const ItemContentStyles = css({
-  padding: "1rem",
-});
-
-export const Item: FunctionComponent<PropsWithChildren<ItemProps>> = ({
-  id,
-  title,
-  hide,
-  children,
-}) => {
-  if (hide) {
-    return <div></div>;
-  }
-  return (
-    <div css={ItemStyles} id={id}>
-      <div css={ItemTitleStyles}>{title}</div>
-      <div css={ItemContentStyles}>{children}</div>
-    </div>
-  );
-};
-
 export const Literal: FunctionComponent<{ children: any }> = ({ children }) => (
-  <div css={{ color: "#5da713", display: "inline" }}>{children}</div>
+  <div css={{ color: Colors.literal, display: "inline" }}>{children}</div>
 );
 
 export const KeyValueSection: FunctionComponent<{ children: ReactElement | ReactElement[] }> = ({
diff --git a/packages/html-program-viewer/src/constants.ts b/packages/html-program-viewer/src/constants.ts
index 220c9e5bda..d2c9d87f85 100644
--- a/packages/html-program-viewer/src/constants.ts
+++ b/packages/html-program-viewer/src/constants.ts
@@ -1,4 +1,28 @@
-export const Colors = {
-  typeKind: "#7a3e9d",
+const variablePrefix = `--tsp-tgv`;
+export const ColorsVariables = {
+  background: `${variablePrefix}-background`,
+  dataKey: `${variablePrefix}-data-key`,
+  indentationGuide: `${variablePrefix}-indentation-guide`,
+  literal: `${variablePrefix}-literal`,
+  property: `${variablePrefix}-property`,
+  ref: `${variablePrefix}-ref`,
+  typeKind: `${variablePrefix}-type-kind`,
+  typeName: `${variablePrefix}-type-name`,
+} as const;
+
+export type ColorVariable = keyof typeof ColorsVariables;
+export type ColorPalette = Record<ColorVariable, string>;
+export const DefaultColors: ColorPalette = {
+  background: "#f3f3f3",
+  dataKey: "#333333",
   indentationGuide: "#777",
+  literal: "#5da713",
+  property: "#9c5d27",
+  ref: "#268bd2",
+  typeKind: "#7a3e9d",
+  typeName: "#333333",
 };
+
+export const Colors: typeof ColorsVariables = Object.fromEntries(
+  Object.entries(ColorsVariables).map(([k, v]) => [k, `var(${v}, ${(DefaultColors as any)[k]})`])
+) as any;
diff --git a/packages/html-program-viewer/src/index.ts b/packages/html-program-viewer/src/index.ts
index 1789ee445b..dd9bb34234 100644
--- a/packages/html-program-viewer/src/index.ts
+++ b/packages/html-program-viewer/src/index.ts
@@ -1,2 +1,4 @@
+export { ColorProvider, ColorProviderProps } from "./color-provider.js";
+export type { ColorPalette } from "./constants.js";
 export * from "./emitter.js";
 export { TypeSpecProgramViewer } from "./ui.js";
diff --git a/packages/html-program-viewer/src/type-ui-base.tsx b/packages/html-program-viewer/src/type-ui-base.tsx
index 2ec0b8ac90..7b54fed8f6 100644
--- a/packages/html-program-viewer/src/type-ui-base.tsx
+++ b/packages/html-program-viewer/src/type-ui-base.tsx
@@ -24,7 +24,7 @@ export interface TypeUIBaseProps {
 
 const TypeNameStyles = css({
   display: "inline",
-  color: "#333333",
+  color: Colors.typeName,
 });
 
 export const TypeUIBase: FunctionComponent<TypeUIBaseProps> = (props) => {
@@ -32,7 +32,7 @@ export const TypeUIBase: FunctionComponent<TypeUIBaseProps> = (props) => {
   const properties = props.properties.map((prop) => {
     return (
       <li key={prop.name}>
-        <span css={{ color: "#9c5d27" }} title={prop.description}>
+        <span css={{ color: Colors.property }} title={prop.description}>
           {prop.name}
         </span>
         : <span>{prop.value}</span>
diff --git a/packages/html-program-viewer/src/ui.tsx b/packages/html-program-viewer/src/ui.tsx
index 40097b138c..e1fcf10490 100644
--- a/packages/html-program-viewer/src/ui.tsx
+++ b/packages/html-program-viewer/src/ui.tsx
@@ -18,6 +18,7 @@ import {
 import React, { FunctionComponent, ReactElement, useContext } from "react";
 import ReactDOMServer from "react-dom/server";
 import { KeyValueSection, Literal } from "./common.js";
+import { Colors } from "./constants.js";
 import { inspect } from "./inspect.js";
 import { TypeUIBase, TypeUIBaseProperty } from "./type-ui-base.js";
 import { getIdForType, isNamedUnion } from "./utils.js";
@@ -39,7 +40,7 @@ export interface TypeSpecProgramViewerProps {
 
 const ProgramViewerStyles = css({
   fontFamily: "monospace",
-  backgroundColor: "#f3f3f3",
+  backgroundColor: Colors.background,
   li: {
     margin: 0,
     listStyle: "none",
@@ -347,7 +348,7 @@ const NamedTypeRef: FunctionComponent<{ type: NamedType }> = ({ type }) => {
   return (
     <a
       css={{
-        color: "#268bd2",
+        color: Colors.ref,
         textDecoration: "none",
 
         "&:hover": {
@@ -422,7 +423,7 @@ const TypeData: FunctionComponent<{ type: Type }> = ({ type }) => {
     <KeyValueSection>
       {entries.map(([k, v], i) => (
         <div css={{ display: "flex" }} key={i}>
-          <div css={{ color: "#333", marginRight: "5px" }}>{k.toString()}:</div>{" "}
+          <div css={{ color: Colors.indentationGuide, marginRight: "5px" }}>{k.toString()}:</div>{" "}
           <div>{inspect(v)}</div>
         </div>
       ))}
diff --git a/packages/playground/src/react/output-view.tsx b/packages/playground/src/react/output-view.tsx
index 144b21a224..76955dd503 100644
--- a/packages/playground/src/react/output-view.tsx
+++ b/packages/playground/src/react/output-view.tsx
@@ -1,7 +1,7 @@
 import { css } from "@emotion/react";
 import { tokens } from "@fluentui/react-components";
 import { Diagnostic, Program } from "@typespec/compiler";
-import { TypeSpecProgramViewer } from "@typespec/html-program-viewer";
+import { ColorPalette, ColorProvider, TypeSpecProgramViewer } from "@typespec/html-program-viewer";
 import { FunctionComponent, useCallback, useEffect, useMemo, useState } from "react";
 import { ErrorTab, InternalCompilerError } from "./error-tab.js";
 import { FileOutput } from "./file-output.js";
@@ -159,7 +159,7 @@ const OutputContent: FunctionComponent<OutputContentProps> = ({
             overflow: "scroll",
           }}
         >
-          {program && <TypeSpecProgramViewer program={program} />}
+          {program && <TypeGraphViewer program={program} />}
         </div>
       );
   }
@@ -185,3 +185,25 @@ const ErrorTabCountStyles = css({
   padding: "0 5px",
   borderRadius: "20px",
 });
+
+interface TypeGraphViewerProps {
+  program: Program;
+}
+const TypeGraphViewer = ({ program }: TypeGraphViewerProps) => {
+  return (
+    <ColorProvider colors={TypeGraphColors}>
+      <TypeSpecProgramViewer program={program} />
+    </ColorProvider>
+  );
+};
+
+const TypeGraphColors: ColorPalette = {
+  background: tokens.colorNeutralBackground1,
+  typeKind: tokens.colorPaletteBerryForeground2,
+  typeName: tokens.colorNeutralForeground2,
+  dataKey: tokens.colorNeutralForeground2,
+  ref: tokens.colorBrandForeground1,
+  literal: tokens.colorPaletteLightGreenForeground2,
+  indentationGuide: tokens.colorNeutralForeground4,
+  property: tokens.colorPaletteMarigoldForeground2,
+};