diff --git a/.changeset/tasty-yaks-leave.md b/.changeset/tasty-yaks-leave.md
new file mode 100644
index 0000000..fda5295
--- /dev/null
+++ b/.changeset/tasty-yaks-leave.md
@@ -0,0 +1,6 @@
+---
+"fogbender": minor
+"fogbender-react": minor
+---
+
+Dark/light mode switch
diff --git a/packages/fogbender-react/src/index.tsx b/packages/fogbender-react/src/index.tsx
index 266a9bd..77bc9da 100644
--- a/packages/fogbender-react/src/index.tsx
+++ b/packages/fogbender-react/src/index.tsx
@@ -119,7 +119,8 @@ export const FogbenderConfig: React.FC<{
   clientUrl?: string;
   env?: Env;
   token: Token | undefined;
-}> = ({ clientUrl, env, token }) => {
+  mode?: "light" | "dark";
+}> = ({ clientUrl, env, token, mode = "light" }) => {
   const fogbender = useFogbender();
   React.useEffect(() => {
     fogbender.setClientUrl(clientUrl);
@@ -139,6 +140,9 @@ export const FogbenderConfig: React.FC<{
       fogbender.setToken(undefined);
     };
   }, [token]);
+  React.useEffect(() => {
+    fogbender.setMode(mode);
+  }, [mode]);
   return null;
 };
 
diff --git a/packages/fogbender/package.json b/packages/fogbender/package.json
index ba5aaab..0fc04bf 100644
--- a/packages/fogbender/package.json
+++ b/packages/fogbender/package.json
@@ -66,7 +66,7 @@
     "dist"
   ],
   "dependencies": {
-    "solid-js": "^1.2.6",
+    "solid-js": "1.8.0",
     "twind": "^0.16.16"
   }
 }
diff --git a/packages/fogbender/src/createIframe.ts b/packages/fogbender/src/createIframe.ts
index 6a7857f..849d847 100644
--- a/packages/fogbender/src/createIframe.ts
+++ b/packages/fogbender/src/createIframe.ts
@@ -50,6 +50,7 @@ export function renderIframe(
     headless,
     disableFit,
     onVisitorInfo,
+    initialMode = () => "light",
   }: {
     rootEl: HTMLElement;
     env: Env | undefined;
@@ -58,9 +59,11 @@ export function renderIframe(
     onVisitorInfo: (info: VisitorInfo, reload: boolean) => void;
     headless?: boolean;
     disableFit?: boolean;
+    initialMode: () => "dark" | "light";
   },
   openWindow: () => void
 ) {
+  let _mode = initialMode();
   const iFrame = document.createElement("iframe");
 
   iFrame.src = url;
@@ -82,7 +85,7 @@ export function renderIframe(
       return;
     }
     if (e.data?.type === "APP_IS_READY") {
-      iFrame.contentWindow?.postMessage({ env, initToken: token, headless }, url);
+      iFrame.contentWindow?.postMessage({ env, initToken: token, headless, mode: _mode }, url);
       iFrame.contentWindow?.postMessage(
         { notificationsPermission: window.Notification?.permission },
         url
@@ -173,13 +176,21 @@ export function renderIframe(
     iFrame.style.height = height + "px";
   }
 
+  function setMode(mode: "light" | "dark") {
+    _mode = mode;
+    iFrame.contentWindow?.postMessage({ mode }, url);
+  }
+
   adaptIFrame();
 
   new ResizeSensor(rootEl, adaptIFrame);
   new ResizeSensor(document.body, adaptIFrame);
   window.addEventListener("resize", adaptIFrame);
-  return () => {
-    iFrame.src = "about:blank";
-    rootEl.removeChild(iFrame);
+  return {
+    setIframeMode: setMode,
+    cleanup: () => {
+      iFrame.src = "about:blank";
+      rootEl.removeChild(iFrame);
+    },
   };
 }
diff --git a/packages/fogbender/src/index.ts b/packages/fogbender/src/index.ts
index 0499003..48f216f 100644
--- a/packages/fogbender/src/index.ts
+++ b/packages/fogbender/src/index.ts
@@ -23,9 +23,10 @@ export const createNewFogbender = (): Fogbender => {
     env: undefined as Env | undefined,
     token: undefined as Token | undefined,
     url: defaultUrl as string | undefined,
-    iframe: undefined as HTMLIFrameElement | undefined,
     events: createEvents(),
     chatWindow: null as null | Window,
+    mode: "light" as "light" | "dark",
+    setIframeMode: undefined as ((mode: "light" | "dark") => void) | undefined,
   };
   const openWindow = () => {
     if (!state.chatWindow || state.chatWindow.closed) {
@@ -67,6 +68,13 @@ export const createNewFogbender = (): Fogbender => {
       updateConfigured();
       return fogbender;
     },
+    async setMode(mode) {
+      state.mode = mode;
+      if (state.setIframeMode) {
+        state.setIframeMode(mode);
+      }
+      return fogbender;
+    },
     async setToken(token) {
       const tokenCheck = checkToken(token);
       // true means bad
@@ -134,14 +142,19 @@ export const createNewFogbender = (): Fogbender => {
                   storeVisitorInfo(info);
                   if (reload) {
                     cleanup();
-                    cleanup = rerender();
+                    const { cleanup: cleanup2, setIframeMode } = rerender();
+                    state.setIframeMode = setIframeMode;
+                    cleanup = cleanup2;
                   }
                 },
+                initialMode: () => state.mode,
               },
               openWindow
             );
           };
-          let cleanup = rerender();
+          const { cleanup: cleanup0, setIframeMode } = rerender();
+          state.setIframeMode = setIframeMode;
+          let cleanup = cleanup0;
           return () => {
             cleanup();
           };
@@ -168,14 +181,19 @@ export const createNewFogbender = (): Fogbender => {
               storeVisitorInfo(info);
               if (reload) {
                 cleanup();
-                cleanup = rerender();
+                const { cleanup: cleanup3, setIframeMode } = rerender();
+                state.setIframeMode = setIframeMode;
+                cleanup = cleanup3;
               }
             },
+            initialMode: () => state.mode,
           },
           openWindow
         );
       };
-      let cleanup = rerender();
+      const { cleanup: cleanup1, setIframeMode } = rerender();
+      state.setIframeMode = setIframeMode;
+      let cleanup = cleanup1;
       return () => {
         cleanup();
       };
diff --git a/packages/fogbender/src/server.ts b/packages/fogbender/src/server.ts
index b6314eb..12f81cf 100644
--- a/packages/fogbender/src/server.ts
+++ b/packages/fogbender/src/server.ts
@@ -11,6 +11,7 @@ export const createNewFogbender = (): Fogbender => {
     url: undefined as string | undefined,
     iframe: undefined as HTMLIFrameElement | undefined,
     chatWindow: null as null | Window,
+    mode: "light" as "light" | "dark",
   };
   const fogbender: Fogbender & { _privateData: any } = {
     _privateData: state,
@@ -60,6 +61,10 @@ export const createNewFogbender = (): Fogbender => {
     async renderUnreadBadge() {
       return () => {};
     },
+    async setMode(_mode: "light" | "dark") {
+      state.mode = _mode;
+      return fogbender;
+    },
   };
   return fogbender;
 };
diff --git a/packages/fogbender/src/types.ts b/packages/fogbender/src/types.ts
index d93f467..e892e6d 100644
--- a/packages/fogbender/src/types.ts
+++ b/packages/fogbender/src/types.ts
@@ -79,6 +79,7 @@ export interface Fogbender {
   setEnv(env: Env | undefined): Promise<Fogbender>;
   setClientUrl(url: string | undefined): Promise<Fogbender>;
   setToken(token: Token | undefined): Promise<Fogbender>;
+  setMode(mode: "light" | "dark"): Promise<Fogbender>;
   isClientConfigured(): Promise<Snapshot<boolean>>;
   renderIframe(opts: {
     rootEl: HTMLElement;