diff --git a/app/Chat.tsx b/app/Chat.tsx
new file mode 100644
index 0000000..376a285
--- /dev/null
+++ b/app/Chat.tsx
@@ -0,0 +1,350 @@
+import { View, Text, FlatList, TextInput } from "react-native";
+import currentTheme from "./Themes";
+import { useState } from "react";
+
+// TODO: better shadows for everything
+
+type BubbleSide = "left" | "right";
+type ChatMessageProps = {
+  side: BubbleSide;
+  width: number;
+  height: number;
+};
+
+type messageData = {
+  id: string;
+  side: BubbleSide;
+  width: number;
+  height: number;
+};
+
+// NOTE: only for testing
+const getRandomInt = (min: number, max: number) => {
+  min = Math.ceil(min);
+  max = Math.floor(max);
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+};
+
+const randomWidth = () => getRandomInt(100, 400);
+const randomHeight = () => getRandomInt(50, 100);
+
+const messages: messageData[] = [
+  // {{{
+  {
+    id: "1",
+    side: "left",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  {
+    id: "2",
+    side: "right",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  {
+    id: "3",
+    side: "left",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  {
+    id: "4",
+    side: "right",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  {
+    id: "5",
+    side: "left",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  {
+    id: "6",
+    side: "right",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  {
+    id: "7",
+    side: "left",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  {
+    id: "8",
+    side: "right",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  {
+    id: "9",
+    side: "left",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  {
+    id: "10",
+    side: "right",
+    width: randomWidth(),
+    height: randomHeight(),
+  },
+  // {
+  //   id: "11",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "12",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "13",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "14",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "15",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "16",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "17",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "18",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "19",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "20",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "21",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "22",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "23",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "24",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "25",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "26",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "27",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "28",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "29",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "30",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "31",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "32",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "33",
+  //   side: "left",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  // {
+  //   id: "34",
+  //   side: "right",
+  //   width: randomWidth(),
+  //   height: randomHeight(),
+  // },
+  //, width: randomWidth, height: getRandomInt(50, 500) }}}
+];
+
+const Chat = () => {
+  return (
+    <View
+      className="h-full"
+      style={{
+        backgroundColor: currentTheme.primeBg,
+      }}
+    >
+      <ChatHeader />
+      <View
+        className="h-2 bg-black"
+        style={{
+          shadowColor: "#000",
+          shadowOffset: {
+            width: 0,
+            height: 5,
+          },
+          shadowOpacity: 0.34,
+          shadowRadius: 6.27,
+
+          elevation: 10,
+        }}
+      />
+      <FlatList
+        inverted
+        data={messages}
+        renderItem={({ item }) => (
+          <ChatMessage
+            side={item.side}
+            width={item.width}
+            height={item.height}
+          />
+        )}
+        keyExtractor={(item) => item.id}
+        // extraData={selectedId} might need this later for re-rendering
+      />
+      <ChatInput />
+    </View>
+  );
+};
+
+const ChatHeader = () => {
+  return (
+    <View
+      className="flex flex-row items-center py-4"
+      style={{
+        backgroundColor: currentTheme.chatBot,
+      }}
+    >
+      <View
+        className="ml-3 w-12 h-12 rounded-3xl border border-solid"
+        style={{
+          backgroundColor: currentTheme.placeholderBg,
+          borderColor: currentTheme.primeFg,
+        }}
+      ></View>
+      <Text className="text-lg pl-3">CalChat</Text>
+    </View>
+  );
+};
+
+const ChatInput = () => {
+  const [text, onChangeText] = useState("Nachricht");
+
+  return (
+    <View className="flex flex-row w-full h-8 my-2">
+      <TextInput
+        className="w-4/5 h-full border border-solid rounded-2xl mx-2 px-2"
+        style={{
+          backgroundColor: currentTheme.messageBorderBg,
+        }}
+        onChangeText={onChangeText}
+        value={text}
+      />
+      <View
+        className="w-8 h-full rounded-2xl"
+        style={{
+          backgroundColor: currentTheme.placeholderBg,
+        }}
+      ></View>
+    </View>
+  );
+};
+
+const ChatMessage = (props: ChatMessageProps) => {
+  const borderColor =
+    props.side === "left" ? currentTheme.chatBot : currentTheme.primeFg;
+  const selfSide =
+    props.side === "left"
+      ? "self-start ml-2 rounded-bl-sm"
+      : "self-end mr-2 rounded-br-sm";
+
+  return (
+    <View
+      className={
+        `bg-white border-2 border-solid rounded-xl my-2 ` + `${selfSide}`
+      }
+      style={{
+        width: props.width,
+        height: props.height,
+        borderColor: borderColor,
+
+        elevation: 8,
+      }}
+    >
+      <Text className="p-1">Lorem Ipsum Dolor sit amet</Text>
+    </View>
+  );
+};
+
+export default Chat;
diff --git a/app/Themes.tsx b/app/Themes.tsx
new file mode 100644
index 0000000..501fb4f
--- /dev/null
+++ b/app/Themes.tsx
@@ -0,0 +1,18 @@
+type Theme = {
+  chatBot: string,
+  primeFg: string,
+  primeBg: string,
+  messageBorderBg: string,
+  placeholderBg: string,
+}
+
+const defaultLight: Theme = {
+  chatBot: "#DE6C20",
+  primeFg: "#3B3329",
+  primeBg: "#FFEEDE",
+  messageBorderBg: "#FFFFFF",
+  placeholderBg: "#D9D9D9"
+}
+
+let currentTheme: Theme = defaultLight;
+export default currentTheme;
diff --git a/app/_layout.tsx b/app/_layout.tsx
index f4da9a1..ee0e86e 100644
--- a/app/_layout.tsx
+++ b/app/_layout.tsx
@@ -2,5 +2,5 @@ import { Stack } from "expo-router";
 import "../global.css";
 
 export default function RootLayout() {
-  return <Stack />;
+  return <Stack screenOptions={{ headerShown: false }} />;
 }
diff --git a/app/index.tsx b/app/index.tsx
index b11933d..67a3cf9 100644
--- a/app/index.tsx
+++ b/app/index.tsx
@@ -1,8 +1,8 @@
 import React from "react";
-import ManyHelloes from "./Hello_World";
+import Chat from "./Chat";
 
 export default function Index() {
   return (
-    <ManyHelloes/>
+    <Chat />
   );
 }