body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    padding: 20px;
}

h1 {
    color: #333;
}

form {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

label {
    display: block;
    margin-top: 10px;
}

input[type="text"], textarea {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    margin-top: 15px;
    padding: 10px 20px;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

nav {
    background-color: #f8f9fa;
    padding: 10px;
}
nav a {
    margin-right: 15px;
    text-decoration: none;
    color: #007BFF;
}
nav a:hover {
    text-decoration: underline;
}

table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    border: 1px solid #ccc;
    padding: 10px;
    text-align: left;
}
th {
    background-color: #f4f4f4;
}
        /* メッセージ表示のスタイル */
        .success {
            color: green;
        }
        .error {
            color: red;
        }