body {
    background-color: #1e1e26;
    color: #ffffff;
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.card {
    background-color: #2d2d3a;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    text-align: center;
    max-width: 400px;
}

h1 { color: #f0c674; } /* Un tono dorado ajedrecístico */

.btn {
    background-color: #8abeb7;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    margin-top: 20px;
}

.btn:hover { background-color: #6a9e97; }