diff --git a/nuxt.config.ts b/nuxt.config.ts
index d2646b7..ba902ce 100644
--- a/nuxt.config.ts
+++ b/nuxt.config.ts
@@ -5,6 +5,10 @@ export default defineNuxtConfig({
     transpile: ['trpc-nuxt'],
   },
 
+  css: [
+    '@/assets/css/main.scss',
+  ],
+
   modules: [
     '@pinia/nuxt',
     '@pinia-plugin-persistedstate/nuxt',
@@ -17,6 +21,13 @@ export default defineNuxtConfig({
     'nuxt-icon',
   ],
 
+  colorMode: {
+    preference: 'system',
+    fallback: 'light',
+    classPrefix: '',
+    classSuffix: '',
+  },
+
   devtools: {
     enabled: true,
     vscode: {
diff --git a/package.json b/package.json
index 522f39a..1e23958 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,8 @@
     "@types/node": "^18",
     "@unocss/eslint-config": "^0.51.8",
     "@unocss/nuxt": "^0.51.8",
+    "@unocss/transformer-directives": "^0.51.8",
+    "@unocss/transformer-variant-group": "^0.51.8",
     "@vueuse/core": "^10.1.0",
     "@vueuse/nuxt": "^10.1.0",
     "eslint": "^8.39.0",
diff --git a/src/assets/css/main.scss b/src/assets/css/main.scss
new file mode 100644
index 0000000..0ee8b3d
--- /dev/null
+++ b/src/assets/css/main.scss
@@ -0,0 +1,4 @@
+body {
+  font-family: 'DM Sans', sans-serif;
+  @apply bg-gray-100 dark:bg-dark-900 dark:text-white duration-200
+}
diff --git a/src/composables/useTheme.ts b/src/composables/useTheme.ts
index 19ab0af..e71c0e0 100644
--- a/src/composables/useTheme.ts
+++ b/src/composables/useTheme.ts
@@ -48,9 +48,9 @@ export const useTheme = () => {
       case ColorsTheme.YELLOW:
         return 'bg-yellow-500'
       case ColorsTheme.BLACK:
-        return 'bg-black dark:(bg-white text-black) text-white'
+        return 'bg-black dark:bg-white dark:text-black text-white'
       case ColorsTheme.WHITE:
-        return 'bg-black dark:(bg-white text-black) text-white'
+        return 'bg-black dark:bg-white dark:text-black text-white'
     }
   })
 
diff --git a/src/pages/index.vue b/src/pages/index.vue
index 7698fe7..61f9531 100644
--- a/src/pages/index.vue
+++ b/src/pages/index.vue
@@ -1,20 +1,23 @@
 <script setup lang="ts">
 import { useThemeStore } from '~/store/theme'
 
-const { getColor, getTheme, nextColor, nextTheme } = useThemeStore()
+const { getColor, getTheme, swapColor, nextTheme } = useThemeStore()
 const { getThemeTextColor, getThemeBackgroundColor } = useTheme()
 
+onMounted(() => swapColor())
+
 const { query } = useRoute()
 const { $trpc } = useNuxtApp()
+const color = useColorMode()
 const user = await $trpc.hello.query({ name: query.name?.toString() })
 </script>
 
 <template>
   <section>
-    <h1 :class="`text-sm ${getThemeTextColor}`">
+    <h1 :class="`${getThemeTextColor}`" duration="1000">
       Main page
     </h1>
-    <h1 :class="`${getThemeBackgroundColor}`">
+    <h1 :class="`${getThemeBackgroundColor}`" duration="1000">
       Main Page
     </h1>
     <div>
@@ -26,12 +29,12 @@ const user = await $trpc.hello.query({ name: query.name?.toString() })
     <div>
       Theme colors : {{ getTheme.colors.map((color) => color.charAt(0).toUpperCase() + color.slice(1)).join(', ') }}
     </div>
-    <div @click="nextColor()">
-      setNextColor()
-    </div>
     <div @click="nextTheme()">
       setNextTheme()
     </div>
+    <div @click="color.preference = color.value === 'dark' ? 'light' : 'dark'">
+      toggleDarkMode()
+    </div>
     <div>
       {{ user.greeting }}
     </div>
diff --git a/src/server/trpc/routers/index.ts b/src/server/trpc/routers/index.ts
index ecf71e6..5e8f10a 100644
--- a/src/server/trpc/routers/index.ts
+++ b/src/server/trpc/routers/index.ts
@@ -8,7 +8,7 @@ export const appRouter = router({
     }))
     .query(({ input }) => {
       return {
-        greeting: `Hello ${input.name ?? 'world'}!`,
+        greeting: `Hello ${input.name ?? 'World'}!`,
       }
     }),
 })
diff --git a/src/store/theme.ts b/src/store/theme.ts
index 6773cd9..48fe194 100644
--- a/src/store/theme.ts
+++ b/src/store/theme.ts
@@ -7,20 +7,47 @@ export const useThemeStore = defineStore(
   () => {
     const currentTheme = ref<Theme>(Themes[THEMES.RainbowTheme])
     const currentColor = ref<ColorsTheme>(currentTheme.value.colors[0])
+    let intervalId: NodeJS.Timeout | null = null
+
+    const isAvailable = (next: Theme): boolean => {
+      if (!next.availability)
+        return true
+
+      const today = new Date()
+      const [startDay, startMonth] = next.availability.start.split('/')
+      const [endDay, endMonth] = next.availability.end.split('/')
+      const start = new Date(today.getFullYear(), Number(startMonth) - 1, Number(startDay))
+      const end = new Date(today.getFullYear(), Number(endMonth) - 1, Number(endDay))
+
+      return today >= start && today <= end
+    }
+
+    const swapColor = () => {
+      if (intervalId !== null)
+        clearInterval(intervalId)
+
+      intervalId = setInterval(() => {
+        const colors = currentTheme.value.colors
+        const currentIndex = colors.indexOf(currentColor.value)
+        const nextIndex = (currentIndex + 1) % colors.length
+        currentColor.value = colors[nextIndex]
+      }, 5000)
+    }
 
     const nextTheme = () => {
       const themes = Object.values(Themes)
       const currentIndex = themes.findIndex(theme => theme.name === currentTheme.value.name)
-      const nextIndex = (currentIndex + 1) % themes.length
+      let nextIndex = (currentIndex + 1) % themes.length
+
+      while (!isAvailable(themes[nextIndex])) {
+        nextIndex = (nextIndex + 1) % themes.length
+        if (nextIndex === currentIndex)
+          return
+      }
+
       currentTheme.value = themes[nextIndex]
       currentColor.value = currentTheme.value.colors[0]
-    }
-
-    const nextColor = () => {
-      const colors = currentTheme.value.colors
-      const currentIndex = colors.indexOf(currentColor.value)
-      const nextIndex = (currentIndex + 1) % colors.length
-      currentColor.value = colors[nextIndex]
+      swapColor()
     }
 
     const getTheme = computed(() => currentTheme)
@@ -30,7 +57,7 @@ export const useThemeStore = defineStore(
       getTheme,
       getColor,
       nextTheme,
-      nextColor,
+      swapColor,
     }
   },
   {
diff --git a/types.ts b/types.ts
index 91d2f02..2c19e4e 100644
--- a/types.ts
+++ b/types.ts
@@ -1,3 +1,4 @@
+// Define a theme
 export enum ColorsTheme {
   ORANGE = 'orange',
   YELLOW = 'yellow',
@@ -14,8 +15,13 @@ export enum ColorsTheme {
 export interface Theme {
   name: String
   colors: ColorsTheme[]
+  availability?: {
+    start: String
+    end: String
+  }
 }
 
+// Create the themes
 const RainbowTheme: Theme = {
   name: 'Rainbow',
   colors: [
@@ -32,11 +38,19 @@ const RainbowTheme: Theme = {
 const XMasTheme: Theme = {
   name: 'Xmas',
   colors: [ColorsTheme.RED, ColorsTheme.GREEN],
+  availability: {
+    start: '01/12',
+    end: '31/12',
+  },
 }
 
 const EasterTheme: Theme = {
   name: 'Easter',
   colors: [ColorsTheme.ROSE, ColorsTheme.YELLOW, ColorsTheme.CYAN],
+  availability: {
+    start: '01/04',
+    end: '12/04',
+  },
 }
 
 const BlackAndWhiteTheme: Theme = {
@@ -44,11 +58,40 @@ const BlackAndWhiteTheme: Theme = {
   colors: [ColorsTheme.BLACK, ColorsTheme.WHITE],
 }
 
+const HalloweenTheme: Theme = {
+  name: 'Halloween',
+  colors: [
+    ColorsTheme.ORANGE,
+    ColorsTheme.BLACK,
+    ColorsTheme.GREEN,
+    ColorsTheme.PURPLE,
+  ],
+  availability: {
+    start: '28/10',
+    end: '01/11',
+  },
+}
+
+const ValentineTheme: Theme = {
+  name: 'Valentine',
+  colors: [
+    ColorsTheme.RED,
+    ColorsTheme.ROSE,
+  ],
+  availability: {
+    start: '12/02',
+    end: '16/02',
+  },
+}
+
+// List the themes
 export enum THEMES {
   RainbowTheme,
   EasterTheme,
   XMasTheme,
   BlackAndWhiteTheme,
+  ValentineTheme,
+  HalloweenTheme,
 }
 
 export const Themes = {
@@ -56,4 +99,6 @@ export const Themes = {
   [THEMES.EasterTheme]: EasterTheme,
   [THEMES.XMasTheme]: XMasTheme,
   [THEMES.BlackAndWhiteTheme]: BlackAndWhiteTheme,
+  [THEMES.ValentineTheme]: ValentineTheme,
+  [THEMES.HalloweenTheme]: HalloweenTheme,
 }
diff --git a/uno.config.ts b/uno.config.ts
index 2916cc0..a311983 100644
--- a/uno.config.ts
+++ b/uno.config.ts
@@ -1,8 +1,9 @@
 import {
   defineConfig, presetAttributify, presetIcons,
   presetTypography, presetUno, presetWind,
-  transformerDirectives, transformerVariantGroup,
 } from 'unocss'
+import transformerVariantGroup from '@unocss/transformer-variant-group'
+import transformerDirectives from '@unocss/transformer-directives'
 import { presetScrollbar } from 'unocss-preset-scrollbar'
 import { ColorsTheme } from './types'
 
@@ -13,16 +14,21 @@ export default defineConfig({
     presetIcons(),
     presetTypography(),
     presetScrollbar(),
-    presetWind(),
+    presetWind({
+      dark: 'class',
+    }),
   ],
   transformers: [
     transformerDirectives(),
     transformerVariantGroup(),
   ],
   safelist: [
+    // Theme text colors
     ...Object.values(ColorsTheme).map(color => `text-${color}-500`),
-    'text-white', 'text-black',
+    ...'bg-black dark:bg-white dark:text-black text-white'.split(' '),
+
+    // Theme background colors
     ...Object.values(ColorsTheme).map(color => `bg-${color}-500`),
-    'bg-white', 'bg-black',
+    ...'text-black dark:text-white'.split(' '),
   ],
 })
diff --git a/yarn.lock b/yarn.lock
index 28c2ab1..d765b08 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1745,7 +1745,7 @@
   dependencies:
     "@unocss/core" "0.51.8"
 
-"@unocss/transformer-directives@0.51.8":
+"@unocss/transformer-directives@0.51.8", "@unocss/transformer-directives@^0.51.8":
   version "0.51.8"
   resolved "https://registry.yarnpkg.com/@unocss/transformer-directives/-/transformer-directives-0.51.8.tgz#4fee9fa3fb97dbacc744a21f88b45eff5e835698"
   integrity sha512-Q1vG0dZYaxbdz0pVnvpuFreGoSqmrk7TgKUHNuJP/XzTi04sriQoDSpC2QMIAuOyU7FyGpSjUORiaBm0/VNURw==
@@ -1753,7 +1753,7 @@
     "@unocss/core" "0.51.8"
     css-tree "^2.3.1"
 
-"@unocss/transformer-variant-group@0.51.8":
+"@unocss/transformer-variant-group@0.51.8", "@unocss/transformer-variant-group@^0.51.8":
   version "0.51.8"
   resolved "https://registry.yarnpkg.com/@unocss/transformer-variant-group/-/transformer-variant-group-0.51.8.tgz#342fdade1ece77a0874fd6ff9903c111de1bdfe0"
   integrity sha512-blFQtAntyijFOm+BiiQhroaPwFNX6zYi19wUjY6NdvMAl/g4JzOFTzo+KehQf+lCI3Dvhr8Z2dGtDcnwfqUcDg==