.principal{
    background-image: url("img/PORTADAWEB_Mesadetrabajo1.jpg");
    height: 100vh;
    width: 100%;
    background-size: cover;
    background-position: center;
  background-repeat: no-repeat;

}

.principalvalidar{

   background-image: url("img/PORTADA2_Mesadetrabajo1.jpg");
    height: 100vh;
    width: 100%;
    background-size: cover;
    background-position: center;
  background-repeat: no-repeat;

}

.pic{
    display: flex;
    justify-content: center;
    padding-top: 0.6em;
    align-items: center;
    text-align: center;
}
.imgghama{
    margin: 0.5em;
    display: flex;
    width: 100%;
    height: 60%;
}

.card{
    width: 36rem;
  }


@media only screen and (max-width: 700px) {
 .principal{
    background-image: url("img/fondo.png");
    }   
      .card{
        width: 90vw;
      }
    }