[EDIT]Bootstrapの追加

src/main/resources/templates/authentication.html

@@ -4,6 +4,8 @@
 <head>
 	<meta charset="UTF-8">
 	<title>認証</title>
+	<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
+
 </head>
 
 <body class="pb-5 pt-5">

src/main/resources/templates/login.html

@@ -3,6 +3,8 @@
 <head>
 <meta charset="UTF-8">
 <title>ログイン</title>
+<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
+
 </head>
 <body class="pb-5 pt-5">
 	<div th:replace="~{header :: header}">

src/main/resources/templates/password_reset.html

@@ -3,6 +3,8 @@
 <head>
 <meta charset="UTF-8">
 <title>パスワード再設定</title>
+<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
+
 </head>
 <body>
 <!--<body class="pb-5 pt-5">-->

src/main/resources/templates/profile.html

@@ -3,6 +3,8 @@
 <head>
 <meta charset="UTF-8">
 <title>プロフィール</title>
+<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
+
 </head>
 <body class="pb-5 pt-5">
 	

src/main/resources/templates/profile_edit.html

@@ -3,6 +3,8 @@
 <head>
 <meta charset="UTF-8">
 <title>プロフィール編集</title>
+<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
+
 </head>
 <body class="pb-5 pt-5">
 	

src/main/resources/templates/user_register.html

@@ -3,6 +3,8 @@
 <head>
 <meta charset="UTF-8">
 <title>新規会員登録</title>
+<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
+
 </head>
 <body class="pb-5 pt-5">
 	<div th:replace="~{header :: header}">

src/main/resources/templates/user_register_confirm.html

@@ -4,6 +4,8 @@
 <head>
 	<meta charset="UTF-8">
 	<title>新規会員登録確認</title>
+	<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
+
 </head>
 
 <body class="pb-5 pt-5">

src/main/resources/templates/user_register_return.html

@@ -3,6 +3,8 @@
 <head>
 <meta charset="UTF-8">
 <title>新規会員登録</title>
+<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
+
 </head>
 <body class="pb-5 pt-5">
 	<div th:replace="~{header :: header}">