body {
  background-image:url(/gifs/visualsnow.gif);
  background-size: cover; 
  display: grid;
  place-items: center; /* Centers everything horizontally and vertically */
  align-content: center; /* Ensures content groups don't break during resize */
}

#spaceshark {
  position: relative;
  display: grid;
  place-items: center; /* Centers everything horizontally and vertically */
  align-content: center; /* Ensures content groups don't break during resize */ 
  top: 35vh;
}