.imagen_fondo{
  position: absolute;
  width: 100%;
  height: 100vh;
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;
}

#header_login{
  position: absolute;
  top: 0;
  z-index: 1;
}

footer {
  position: absolute;
  bottom: 0;
}

.login-container{
  z-index: 10000000000;
}