#container {
  background-color: #fff8e3; 
  margin: 0 auto;
  width: 400px;
}

.square,
.circle {
  width: 100px;
  height: 100px;
  display: block;
  position: relative;
  /* float: right; */
}
.circle {
  border-radius: 50%;
}

#blockGreen {
  background-color: #e7efc0;
  /* position: absolute; */
}
#blockPurple {
  /* margin-top: 400px; */
  background-color: #b394bf;
  
}