body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background: #f4f4f4;
    max-width: 1500px; /* ancho máximo del contenido */
    margin: 0 auto;    /* centra horizontalmente */
    padding: 0 20px;   /* espacio interno a los lados */
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #222;
    text-align: center;
    width: 100%;
}

        .box {
            max-width: 1200px;
            background: white;
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 0 15px rgba(0,0,0,0.1);
            max-width: 800px;
            text-align: justify;
        }
        h1 {
            margin-bottom: 10px;
            text-align: center;
            color: rgb(182, 114, 5);
        }
        #countdown {
            font-size: 1.6em;
            font-weight: bold;
            margin-top: 20px;
            color: #0077cc;
        }
    header, main, footer {
    display: block;
    width: 100%;
}