body {
    font-family: Arial, "メイリオ", sans-serif;
    background:#f5f5f5;
    text-align:center;
    padding:80px 20px;
}
.container {
    background:white;
    padding:40px;
    max-width:600px;
    margin:0 auto;
    border-radius:10px;
    box-shadow:0 0 10px rgba(0,0,0,.1);
}
h1 { color:#d9534f; }
a {
    display:inline-block;
    margin-top:20px;
    padding:10px 20px;
    background:#007bff;
    color:white;
    text-decoration:none;
    border-radius:5px;
}
a:hover { background:#0056b3; }