body {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    color: #222;
}

.titulo-principal {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100px;
    border-radius: 10%;
    border-style: groove;
    width: 100%;
    text-transform: uppercase;
    background-color: black;
    color: azure;
}

.subtitulo {
    display: flex;
    justify-content: center;
    padding: 10px;
    background-color: #ddd;
}

.contenido {
    display: flex;
    justify-content: center;
    padding: 20px;
}