* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    font-family: Arial, sans-serif;
    background: #f4f7fb;
}

.card {
    width: min(92%, 560px);
    padding: 40px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

h1 {
    margin-top: 0;
}

a {
    display: inline-block;
    margin-top: 16px;
    padding: 10px 16px;
    border-radius: 6px;
    background: #1f5eff;
    color: #fff;
    text-decoration: none;
}