body{
  background-image: url("fondo.webp");
 background-size: cover;
}

.under{
      margin: 200px auto 0 auto;
      background-color: white;
      width: 50%;
      padding: 40px;
      opacity: 0.6;
      text-align: center;
  }
}

.under h1{
    color: #000;
    text-align: center;
}