.contenedor {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

a {
    display: inline-block;
    padding: 0.5rem 1rem;
    margin: 0.5rem;
    border: 2px solid #333;
    border-radius: 4px;
    color: #333;
    text-decoration: none;
    text-transform: uppercase;
    font-weight: bold;
    letter-spacing: 1px;
}

a:hover {
    background-color: #333;
    color: #fff;
}