body {
  background: #393d48;
}

.thumbnail {
  width: 230px;
  height: 80px;
  opacity: 0.8;
  
  background-position: 0% 0%;
  transition: ease 750ms background-position;
  -webkit-transition: ease 750ms background-position;
  -moz-transition: ease 750ms background-position;
  -ms-transition: ease 750ms background-position;
  -o-transition: ease 750ms background-position;
}
.thumbnail:hover,
.thumbnail:focus {
  background-position: 0% 100%;
}

#drop_zone {
  margin-left: -115px;
  margin-top: -40px;
  position: absolute;
  top: 250px;
  left: 480px;
}