.mydiv-page-img {
    /* The image used */
    background-image: url('../images/contacto.jpg');
    
}

  .col-page-contacto img{
    margin-bottom: 20px;
  }


  /*De 0px hasta 758px*/
@media (max-width: 768px){
  .col-page-contacto{  
      padding: 0px;
      margin: 0px;
      width: 100%;      
  }

  .col-page-contacto img{
    width: 100%;
  }
  
  .col-page-contacto p, .col-page-contacto h1{  
    margin-left: 1.6rem;
    margin-right: 1.6rem;
  }

}