[EDIT] コース選択画面のデザインを修正しました。

src/main/java/com/example/demo/aop/handler/GlobalExceptionHandler.java

@@ -32,7 +32,7 @@ public class GlobalExceptionHandler {
                 "システムエラーが発生しました。"
                 + "初めからやり直してください。");
 
-        return "error";
+        return "redirect:/login";
 		
 	}
 

src/main/java/com/example/demo/app/presentation/controller/PasswordResetController.java

@@ -52,7 +52,7 @@ public class PasswordResetController {
 	    System.out.println("isReset=" + isReset);
 
 	    if(!isReset) {
-	        model.addAttribute("Message", "パスワードが一致しません。");
+	        model.addAttribute("message", "パスワードが一致しません。");
 	        return "password_reset";
 	    }
 

src/main/resources/templates/select_course.html

@@ -14,7 +14,7 @@
 	
 	
 	<form th:action="${mode == 'regist'} ? @{/user/register/return}: @{/change}" method="post">  
-		<button type="submit" class="btn btn-primary">確定</button>
+		<button type="submit" class="btn btn-primary w-100">確定</button>
 
 		<div class="accordion" id="accordionExample">
 		  <div class="accordion-item" th:each="course:${courseList}">
@@ -27,7 +27,7 @@
 		    <div th:id="'collapse' + ${course.courseId}" class="accordion-collapse collapse" data-bs-parent="#accordionExample">
 		      <div class="accordion-body">
 		        <span th:text="${course.description}"></span>
-				<table border="1">
+				<table class="table table-bordered">
 					<tr>
 						<th>カテゴリ名</th><th>配分(%)</th>
 					</tr>

src/main/resources/templates/transaction_create.html

@@ -29,18 +29,16 @@
 	                  method="post">
 
 					<div class="mb-3">
-
 				      <label for="transactionDate"
 					         class="form-label">
 							 日付
 					  </label>
-
 				      <input type="date" 
 					         id="transactionDate" 
-	                           class="form-control"
+							 class="form-select"
+							 name="transactionDate" 
 							 th:value="*{transactionDate}"
 							 required>
-
 					</div>
 
 	                <div class="mb-3">