body {
    margin: 0;
    min-height: 100vh;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    background: linear-gradient(135deg, #0f172a, #1e293b);
    color: #f8fafc;
    width: 90%;
}

.copyright {
    text-align: center;
}

.copyright img {
    width: 20px;
    vertical-align: middle;
}

.boton-volver {
    text-align: center;
    margin: 30px 0;
}

.boton-volver a {
    display: inline-block;
    padding: 10px 20px;
    background-color: #0ea5e9;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.boton-volver a:hover {
    background-color: #0284c7;
}