body { font-family: Arial; background:#f4f4f4; margin:0; }
h1 { text-align:center; padding:20px; }
.card {
    max-width:350px;
    margin:20px auto;
    background:white;
    padding:20px;
    border-radius:10px;
    text-align:center;
}
.btn {
    display:inline-block;
    padding:12px 20px;
    background:#0077cc;
    color:white;
    text-decoration:none;
    border-radius:5px;
}