img {
  width: 50vw;
  height: 50vh;
  object-fit: cover;   /* fills the half-screen box */
  object-position: center;
  display: block;

  margin: 0 auto;

}

body {
  margin: 0;
  background-image: url("img/tigerBG.jpg");
  background-size: cover;      /* fills the screen */
  background-position: center; /* centers the image */
  background-repeat: no-repeat;
  color: white;
}