body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-image: url(../images/fondo.png);
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  /*background-size: 1400px 650px;*/
  background-size: contain; /* o background-size: contain; */
  background-color: #f8f9fa;
}