body {
    font-family: 'Arial', sans-serif;
    background-color: #f8f9fa;
    margin: 0;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

/* === フォーム枠 === */
.form {
    background-color: #ffffff;
    padding: 30px 25px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    box-sizing: border-box;
}

/* === ボタン === */
input[type="submit"] {
    width: 100%;
    padding: 12px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

input[type="submit"]:hover {
    background-color: #0056b3;
}

/* === お知らせ文 === */
p {
    text-align: center;
    margin: 20px 0 0px;
    color: #666;
}

img {
    width: 160px;
    height: 160px;
    margin-bottom: 20px;
}