body {
  background-image: url('sea.jpg');
  background-repeat: repeat;
  background-size: auto;
  color : white;
  
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  
  flex-direction: column;
}

img.nike {
  height:400px;
  width:340px;
}