diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 44985e9..c7b1d1f 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,14 +4,13 @@
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   <component name="ChangeListManager">
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-      <change afterPath="$PROJECT_DIR$/frontend/postcss.config.cjs" afterDir="false" />
+    <list default="true" id="58b952d2-2253-4e80-8b30-0eef029dc0b0" name="Changes" comment="Implemented basic app with Mantine SegmentedControl">
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       <change beforePath="$PROJECT_DIR$/frontend/package.json" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/package.json" afterDir="false" />
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-      <change beforePath="$PROJECT_DIR$/frontend/src/main.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/src/main.tsx" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/src/index.css" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/src/index.css" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/vite.config.ts" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/vite.config.ts" afterDir="false" />
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@@ -19,7 +18,6 @@
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+      <workItem from="1786642848722" duration="5798000" />
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+      <created>1786644785672</created>
+      <option name="number" value="00001" />
+      <option name="presentableId" value="LOCAL-00001" />
+      <option name="project" value="LOCAL" />
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     <servers />
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   <component name="TypeScriptGeneratedFilesManager">
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+  <component name="VcsManagerConfiguration">
+    <MESSAGE value="Implemented basic app with Mantine SegmentedControl" />
+    <option name="LAST_COMMIT_MESSAGE" value="Implemented basic app with Mantine SegmentedControl" />
+  </component>
 </project>
\ No newline at end of file
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 2d73f24..7f36e6b 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -12,9 +12,11 @@
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         "@mantine/dates": "^9.5.1",
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+        "@tailwindcss/vite": "^4.3.3",
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-        "react-dom": "^19.2.8"
+        "react-dom": "^19.2.8",
+        "tailwindcss": "^4.3.3"
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       "version": "0.2.17",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz",
       "integrity": "sha512-wXR/dYpcqKmfWpEdZjiKJOwCNFndD0DMnrW/cYjVGttEkBfVgcLFHoNrlj47mjOVic9yyNu65alsgF4NQyTa2g==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "fdir": "^6.5.0",
@@ -2968,7 +3489,7 @@
       "version": "7.18.2",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
       "integrity": "sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w==",
-      "dev": true,
+      "devOptional": true,
       "license": "MIT"
     },
     "node_modules/update-browserslist-db": {
@@ -3066,7 +3587,6 @@
       "version": "8.2.1",
       "resolved": "https://registry.npmjs.org/vite/-/vite-8.2.1.tgz",
       "integrity": "sha512-EU/eS7BH3XROHh2YnBefjM6DBKA6ZeMZEYQbj7NLWg5wHYlhB8B/Mayd5XsgWq+NFYccDOTemRpdETWR6Ka/lw==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "lightningcss": "^1.33.0",
diff --git a/frontend/package.json b/frontend/package.json
index e6c5b49..7b01ff4 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -13,9 +13,11 @@
     "@mantine/core": "^9.5.1",
     "@mantine/dates": "^9.5.1",
     "@mantine/hooks": "^9.5.1",
+    "@tailwindcss/vite": "^4.3.3",
     "dayjs": "^1.11.21",
     "react": "^19.2.8",
-    "react-dom": "^19.2.8"
+    "react-dom": "^19.2.8",
+    "tailwindcss": "^4.3.3"
   },
   "devDependencies": {
     "@babel/core": "^7.29.7",
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index fb10be4..f4cde50 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,22 +1,95 @@
-import { SegmentedControl } from '@mantine/core';
+import { SegmentedControl, Center, Stack, Button, Text, NumberInput } from '@mantine/core';
+import { TimePicker } from '@mantine/dates';
 import * as React from 'react';
 
 type Workday = 'Monday' | 'Tuesday' | 'Wednesday' | 'Thursday' | 'Friday';
 
 function App() {
     const [selectedDay, setSelectedDay] = React.useState<Workday>('Monday');
+    const [workStart, setWorkStart] = React.useState<Date | null>(null);
+    const [workEnd, setWorkEnd] = React.useState<Date | null>(null);
+    const [breakMins, setBreakMins] = React.useState<number>(0);
+    const [workedHrs, setWorkedHrs] = React.useState<number>(0);
 
-    React.useEffect(() => {
-        console.log("Updated day");
-        console.log(selectedDay);
-    }, [selectedDay]);
+    const getHourDiff = (): number => {
+        // FIX: Ensure both dates are valid before calculating
+        if (!workStart || !workEnd || isNaN(workStart.getTime()) || isNaN(workEnd.getTime())) {
+            return 0;
+        }
+
+        let startMs = workStart.getTime();
+        let endMs = workEnd.getTime();
+
+        let diffMs = endMs - startMs;
+
+        if (diffMs < 0) {
+            diffMs += 24 * 60 * 60 * 1000;
+        }
+
+        const breakMs = breakMins * 60 * 1000;
+        const netMs = diffMs - breakMs;
+
+        return netMs / (1000 * 60 * 60);
+    };
+
+    const getWorkEndTime = (): string => {
+        // FIX: Ensure workStart is valid
+        if (!workStart || !workEnd) return 0;
+        if (!workStart || isNaN(workStart.getTime())) return '--:--';
+
+        const targetDate = new Date(workStart);
+        const additionalTimeMs = (8 * 60 * 60 * 1000) + (breakMins * 60 * 1000);
+        targetDate.setTime(targetDate.getTime() + additionalTimeMs);
+
+        // FIX: Check if result is valid before formatting
+        if (isNaN(targetDate.getTime())) return '--:--';
+
+        const hours = targetDate.getHours().toString().padStart(2, '0');
+        const minutes = targetDate.getMinutes().toString().padStart(2, '0');
+        return `${hours}:${minutes}`;
+    };
 
     return (
-      <SegmentedControl
-        data={['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']}
-        onChange={(value) => setSelectedDay(value as Workday)}
-      />
-    )
+        <Center>
+            <Stack>
+                <SegmentedControl
+                    data={['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']}
+                    onChange={(value) => {
+                        setWorkStart(null);
+                        setWorkEnd(null);
+                        setSelectedDay(value as Workday);
+                    }}
+                    className={"mt-2"}
+                />
+                <TimePicker
+                    value={workStart}
+                    label={"Arbeitsbeginn"}
+                    onChange={setWorkStart}
+                    format="24h"
+                    clearable
+                />
+                <TimePicker
+                    value={workEnd}
+                    label={"Arbeitsende"}
+                    onChange={setWorkEnd}
+                    format="24h"
+                    clearable
+                />
+                <NumberInput
+                    label={"Pause in Minuten"}
+                    value={breakMins}
+                    onChange={(val) => setBreakMins(Number(val))}
+                />
+
+                <Button onClick={() => setWorkedHrs(getHourDiff())}>
+                    Speichern
+                </Button>
+
+                <Text>Gearbeitete Stunden heute: {workedHrs.toFixed(2)}</Text>
+                <Text>Wann du gehen kannst für 8 Stunden: {getWorkEndTime()}</Text>
+            </Stack>
+        </Center>
+    );
 }
 
-export default App
+export default App;
\ No newline at end of file
diff --git a/frontend/src/index.css b/frontend/src/index.css
index 5fb3313..01fc41d 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -1,57 +1,6 @@
-:root {
-  --text: #6b6375;
-  --text-h: #08060d;
-  --bg: #fff;
-  --border: #e5e4e7;
-  --code-bg: #f4f3ec;
-  --accent: #aa3bff;
-  --accent-bg: rgba(170, 59, 255, 0.1);
-  --accent-border: rgba(170, 59, 255, 0.5);
-  --social-bg: rgba(244, 243, 236, 0.5);
-  --shadow:
-    rgba(0, 0, 0, 0.1) 0 10px 15px -3px, rgba(0, 0, 0, 0.05) 0 4px 6px -2px;
-
-  --sans: system-ui, 'Segoe UI', Roboto, sans-serif;
-  --heading: system-ui, 'Segoe UI', Roboto, sans-serif;
-  --mono: ui-monospace, Consolas, monospace;
-
-  font: 18px/145% var(--sans);
-  letter-spacing: 0.18px;
-  color-scheme: light dark;
-  color: var(--text);
-  background: var(--bg);
-  font-synthesis: none;
-  text-rendering: optimizeLegibility;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-
-  @media (max-width: 1024px) {
-    font-size: 16px;
-  }
-}
-
-@media (prefers-color-scheme: dark) {
-  :root {
-    --text: #9ca3af;
-    --text-h: #f3f4f6;
-    --bg: #16171d;
-    --border: #2e303a;
-    --code-bg: #1f2028;
-    --accent: #c084fc;
-    --accent-bg: rgba(192, 132, 252, 0.15);
-    --accent-border: rgba(192, 132, 252, 0.5);
-    --social-bg: rgba(47, 48, 58, 0.5);
-    --shadow:
-      rgba(0, 0, 0, 0.4) 0 10px 15px -3px, rgba(0, 0, 0, 0.25) 0 4px 6px -2px;
-  }
-
-  #social .button-icon {
-    filter: invert(1) brightness(2);
-  }
-}
+@import "tailwindcss";
 
 #root {
-  width: 1126px;
   max-width: 100%;
   margin: 0 auto;
   text-align: center;
@@ -61,51 +10,3 @@
   flex-direction: column;
   box-sizing: border-box;
 }
-
-body {
-  margin: 0;
-}
-
-h1,
-h2 {
-  font-family: var(--heading);
-  font-weight: 500;
-  color: var(--text-h);
-}
-
-h1 {
-  font-size: 56px;
-  letter-spacing: -1.68px;
-  margin: 32px 0;
-  @media (max-width: 1024px) {
-    font-size: 36px;
-    margin: 20px 0;
-  }
-}
-h2 {
-  font-size: 24px;
-  line-height: 118%;
-  letter-spacing: -0.24px;
-  margin: 0 0 8px;
-  @media (max-width: 1024px) {
-    font-size: 20px;
-  }
-}
-p {
-  margin: 0;
-}
-
-code,
-.counter {
-  font-family: var(--mono);
-  display: inline-flex;
-  border-radius: 4px;
-  color: var(--text-h);
-}
-
-code {
-  font-size: 15px;
-  line-height: 135%;
-  padding: 4px 8px;
-  background: var(--code-bg);
-}
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index d1203cd..55cfb75 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -1,11 +1,13 @@
 import { defineConfig } from 'vite'
 import react, { reactCompilerPreset } from '@vitejs/plugin-react'
 import babel from '@rolldown/plugin-babel'
+import tailwindcss from '@tailwindcss/vite'
 
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [
     react(),
-    babel({ presets: [reactCompilerPreset()] })
+    babel({ presets: [reactCompilerPreset()] }),
+      tailwindcss()
   ],
 })