body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    background: linear-gradient(to right, #dbeafe, #f0f9ff);
}


.contenedor {
    width: 90%;
    margin: auto; /* centra */
    display: flex;
    justify-content: center;
    align-items: flex-start;
    margin-top: 20px;
}


.publicidad {
    width: 15%;
    text-align: center;
}


.contenido {
    width: 70%;
    background-color: white;
    padding: 20px;
    box-shadow: 0px 0px 15px rgba(0,0,0,0.2);
    border-radius: 10px;
    text-align: center;
}


h1 {
    color: #002b5c;
    text-transform: uppercase;
    font-size: 24px;
}

h3 {
    color: #003366;
    letter-spacing: 1px;
}


a {
    text-decoration: none;
    color: white;
    background-color: #0077cc;
    padding: 7px 12px;
    margin: 4px;
    display: inline-block;
    border-radius: 8px;
    font-size: 14px;
    transition: 0.3s;
}

a:hover {
    background-color: #004c99;
    transform: scale(1.05);
}


img {
    margin-top: 10px;
    border-radius: 8px;
}