body{
    background-image: linear-gradient(red,blue);
}

.IMAGEN{
    width:50%;
    display: block;
  margin: auto;
}

div.RIN {
  display: flex;
  justify-content: center;
}

.IMAGEN2{
  width: 50%;
}

div.RIN1 {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 600px;
  border: 5px solid rgb(136, 255, 0);
  background-color: aliceblue;
}

.IMAGEN3{
  width: 50%;
  height: 40%;
}