diff --git a/src/main/resources/static/color-modes.js b/src/main/resources/static/color-modes.js
deleted file mode 100644
index 9f22daa..0000000
--- a/src/main/resources/static/color-modes.js
+++ /dev/null
@@ -1,80 +0,0 @@
-/*!
- * Color mode toggler for Bootstrap's docs (https://getbootstrap.com/)
- * Copyright 2011-2023 The Bootstrap Authors
- * Licensed under the Creative Commons Attribution 3.0 Unported License.
- */
-
-(() => {
-  'use strict'
-
-  const getStoredTheme = () => localStorage.getItem('theme')
-  const setStoredTheme = theme => localStorage.setItem('theme', theme)
-
-  const getPreferredTheme = () => {
-    const storedTheme = getStoredTheme()
-    if (storedTheme) {
-      return storedTheme
-    }
-
-    return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light'
-  }
-
-  const setTheme = theme => {
-    if (theme === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches) {
-      document.documentElement.setAttribute('data-bs-theme', 'dark')
-    } else {
-      document.documentElement.setAttribute('data-bs-theme', theme)
-    }
-  }
-
-  setTheme(getPreferredTheme())
-
-  const showActiveTheme = (theme, focus = false) => {
-    const themeSwitcher = document.querySelector('#bd-theme')
-
-    if (!themeSwitcher) {
-      return
-    }
-
-    const themeSwitcherText = document.querySelector('#bd-theme-text')
-    const activeThemeIcon = document.querySelector('.theme-icon-active use')
-    const btnToActive = document.querySelector(`[data-bs-theme-value="${theme}"]`)
-    const svgOfActiveBtn = btnToActive.querySelector('svg use').getAttribute('href')
-
-    document.querySelectorAll('[data-bs-theme-value]').forEach(element => {
-      element.classList.remove('active')
-      element.setAttribute('aria-pressed', 'false')
-    })
-
-    btnToActive.classList.add('active')
-    btnToActive.setAttribute('aria-pressed', 'true')
-    activeThemeIcon.setAttribute('href', svgOfActiveBtn)
-    const themeSwitcherLabel = `${themeSwitcherText.textContent} (${btnToActive.dataset.bsThemeValue})`
-    themeSwitcher.setAttribute('aria-label', themeSwitcherLabel)
-
-    if (focus) {
-      themeSwitcher.focus()
-    }
-  }
-
-  window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
-    const storedTheme = getStoredTheme()
-    if (storedTheme !== 'light' && storedTheme !== 'dark') {
-      setTheme(getPreferredTheme())
-    }
-  })
-
-  window.addEventListener('DOMContentLoaded', () => {
-    showActiveTheme(getPreferredTheme())
-
-    document.querySelectorAll('[data-bs-theme-value]')
-      .forEach(toggle => {
-        toggle.addEventListener('click', () => {
-          const theme = toggle.getAttribute('data-bs-theme-value')
-          setStoredTheme(theme)
-          setTheme(theme)
-          showActiveTheme(theme, true)
-        })
-      })
-  })
-})()
diff --git a/src/main/resources/templates/login.html b/src/main/resources/templates/login.html
index cf8a3a9..af8a9d3 100644
--- a/src/main/resources/templates/login.html
+++ b/src/main/resources/templates/login.html
@@ -5,7 +5,6 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>로그인</title>
   <link href="https://getbootstrap.com/docs/5.3/dist/css/bootstrap.min.css" rel="stylesheet">
-  <script src="/color-modes.js"></script>
   <style>
     html,
     body {
@@ -55,4 +54,80 @@ <h1 class="h3 mb-3 fw-normal">공주대처럼 관리자 로그인</h1>
   </form>
 </main>
 </body>
+<script>
+  (() => {
+    'use strict'
+
+    const getStoredTheme = () => localStorage.getItem('theme')
+    const setStoredTheme = theme => localStorage.setItem('theme', theme)
+
+    const getPreferredTheme = () => {
+      const storedTheme = getStoredTheme()
+      if (storedTheme) {
+        return storedTheme
+      }
+
+      return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light'
+    }
+
+    const setTheme = theme => {
+      if (theme === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+        document.documentElement.setAttribute('data-bs-theme', 'dark')
+      } else {
+        document.documentElement.setAttribute('data-bs-theme', theme)
+      }
+    }
+
+    setTheme(getPreferredTheme())
+
+    const showActiveTheme = (theme, focus = false) => {
+      const themeSwitcher = document.querySelector('#bd-theme')
+
+      if (!themeSwitcher) {
+        return
+      }
+
+      const themeSwitcherText = document.querySelector('#bd-theme-text')
+      const activeThemeIcon = document.querySelector('.theme-icon-active use')
+      const btnToActive = document.querySelector(`[data-bs-theme-value="${theme}"]`)
+      const svgOfActiveBtn = btnToActive.querySelector('svg use').getAttribute('href')
+
+      document.querySelectorAll('[data-bs-theme-value]').forEach(element => {
+        element.classList.remove('active')
+        element.setAttribute('aria-pressed', 'false')
+      })
+
+      btnToActive.classList.add('active')
+      btnToActive.setAttribute('aria-pressed', 'true')
+      activeThemeIcon.setAttribute('href', svgOfActiveBtn)
+      const themeSwitcherLabel = `${themeSwitcherText.textContent} (${btnToActive.dataset.bsThemeValue})`
+      themeSwitcher.setAttribute('aria-label', themeSwitcherLabel)
+
+      if (focus) {
+        themeSwitcher.focus()
+      }
+    }
+
+    window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
+      const storedTheme = getStoredTheme()
+      if (storedTheme !== 'light' && storedTheme !== 'dark') {
+        setTheme(getPreferredTheme())
+      }
+    })
+
+    window.addEventListener('DOMContentLoaded', () => {
+      showActiveTheme(getPreferredTheme())
+
+      document.querySelectorAll('[data-bs-theme-value]')
+        .forEach(toggle => {
+          toggle.addEventListener('click', () => {
+            const theme = toggle.getAttribute('data-bs-theme-value')
+            setStoredTheme(theme)
+            setTheme(theme)
+            showActiveTheme(theme, true)
+          })
+        })
+    })
+  })()
+</script>
 </html>
\ No newline at end of file
diff --git a/src/main/resources/templates/registerMessage.html b/src/main/resources/templates/registerMessage.html
index 34f7666..dec3f55 100644
--- a/src/main/resources/templates/registerMessage.html
+++ b/src/main/resources/templates/registerMessage.html
@@ -6,7 +6,6 @@
   <title>공주대처럼 관리자</title>
   <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet"
         integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous">
-  <script src="/color-modes.js"></script>
   <link href="/headers.css" rel="stylesheet">
 </head>
 <body>
@@ -35,7 +34,8 @@ <h3>공주대처럼 관리자</h3>
   <form class="col g-3 needs-validation" method="POST" action="/admin/messages">
     <div class="mb-3 fs-5">[현재 메시지]<br><span th:text="${messages.get(0).message}"></span></div>
     <div class="col">
-      <input type="text" class="form-control" id="message" placeholder="변경할 메시지를 입력해주세요!" name="message" maxlength="16" required>
+      <input type="text" class="form-control" id="message" placeholder="변경할 메시지를 입력해주세요!" name="message" maxlength="16"
+             required>
     </div>
     <div class="mt-3 row justify-content-end">
       <button class="btn btn-primary col-5 mx-3" type="submit">메시지 등록</button>
@@ -79,5 +79,80 @@ <h3>공주대처럼 관리자</h3>
       }
     });
   }
+
+  (() => {
+    'use strict'
+
+    const getStoredTheme = () => localStorage.getItem('theme')
+    const setStoredTheme = theme => localStorage.setItem('theme', theme)
+
+    const getPreferredTheme = () => {
+      const storedTheme = getStoredTheme()
+      if (storedTheme) {
+        return storedTheme
+      }
+
+      return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light'
+    }
+
+    const setTheme = theme => {
+      if (theme === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+        document.documentElement.setAttribute('data-bs-theme', 'dark')
+      } else {
+        document.documentElement.setAttribute('data-bs-theme', theme)
+      }
+    }
+
+    setTheme(getPreferredTheme())
+
+    const showActiveTheme = (theme, focus = false) => {
+      const themeSwitcher = document.querySelector('#bd-theme')
+
+      if (!themeSwitcher) {
+        return
+      }
+
+      const themeSwitcherText = document.querySelector('#bd-theme-text')
+      const activeThemeIcon = document.querySelector('.theme-icon-active use')
+      const btnToActive = document.querySelector(`[data-bs-theme-value="${theme}"]`)
+      const svgOfActiveBtn = btnToActive.querySelector('svg use').getAttribute('href')
+
+      document.querySelectorAll('[data-bs-theme-value]').forEach(element => {
+        element.classList.remove('active')
+        element.setAttribute('aria-pressed', 'false')
+      })
+
+      btnToActive.classList.add('active')
+      btnToActive.setAttribute('aria-pressed', 'true')
+      activeThemeIcon.setAttribute('href', svgOfActiveBtn)
+      const themeSwitcherLabel = `${themeSwitcherText.textContent} (${btnToActive.dataset.bsThemeValue})`
+      themeSwitcher.setAttribute('aria-label', themeSwitcherLabel)
+
+      if (focus) {
+        themeSwitcher.focus()
+      }
+    }
+
+    window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
+      const storedTheme = getStoredTheme()
+      if (storedTheme !== 'light' && storedTheme !== 'dark') {
+        setTheme(getPreferredTheme())
+      }
+    })
+
+    window.addEventListener('DOMContentLoaded', () => {
+      showActiveTheme(getPreferredTheme())
+
+      document.querySelectorAll('[data-bs-theme-value]')
+        .forEach(toggle => {
+          toggle.addEventListener('click', () => {
+            const theme = toggle.getAttribute('data-bs-theme-value')
+            setStoredTheme(theme)
+            setTheme(theme)
+            showActiveTheme(theme, true)
+          })
+        })
+    })
+  })()
 </script>
 </html>
\ No newline at end of file