.navegacion-presentacion {
    margin: 5px auto;
}

.navegacion-presentacion A {
    text-decoration: none;
    font-size: 15px;
    display: flex;
    text-align: center;
    justify-content: center;
    color: white;
    background-color: black;
}

a {
    text-decoration: none;
}

a:link,
 :visited {
    color: blue;
}

h1 {
    font-size: 50px;
    text-align: center;
}

h2 {
    text-align: center;
    text-transform: uppercase;
    border-bottom: 1px solid black;
    padding-bottom: 3px;
}

table {
    font-family: arial, sans-serif;
    border-collapse: collapse;
    width: 100%;
}

td,
th {
    border: 1px solid #dddddd;
    text-align: center;
    padding: 8px;
}

tr:nth-child(even) {
    background-color: #dddddd;
}

.contenedor {
    margin: 0 auto;
    max-width: 1200px;
}

.buscador {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
}

.newsletter {
    margin: 3rem auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    @media (min-width: 768px) {
        padding: 1rem;
        border: 1px solid black;
    }
}