body {
  background: #262626;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding: 0;
  margin: 0;
  height: 100vh;
  overflow: hidden;
}

#target {
  width: 100%;
  height: 100vh;
  opacity: 0;
}

.dog {
  width: 100px;
  height: 100px;
  background-image: url("https://assets.codepen.io/314556/dogSprite5Pack.png");
  position:absolute;
}

img {
  border: solid 2px #42a6e0;
  background-color: black;
}