div {
  width: 300px;
  height: 100px;
  background-color: yellow;
  padding: 2em;
  margin: 50px;
  border: 4px dashed ##ADD8E6;
}

#hello {
  background-color: pink;
}

.cloud{
  background-color: pink;
}

#myButton { 
  padding: 50px;
  background: yellow;
  cursor: pointer;
  transition property: background, transform;
  transition-duration: 1s, .5s;