[EDIT] 日付が自動で記入されるように変更しました。

src/main/resources/templates/transaction_create.html

@@ -4,16 +4,22 @@
 <head>
 	<meta charset="UTF-8">
 	<title>Insert title here</title>
+	<link rel="stylesheet" th:href="@{/css/menu.css}">
+
+	<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
 </head>
 
 <body>
+
+	<div th:replace="~{header :: header}"></div>
+
 	<h1>取引登録</h1>
 
 	<form th:action="@{/transaction/create}" th:object="${transactionForm}" method="post">
 
 		<div>
 			<label for="transactionDate">日付</label>
-			<input type="date" id="transactionDate" th:field="*{transactionDate}">
+			<input type="date" id="transactionDate" name="transactionDate" th:value="*{transactionDate}">
 		</div>
 
 		<br>