body {
  margin: 0;
}

#a {
  position: absolute;
  left: 10%;
  top: 10%;
  width: 500px;
  height: 500px;
  border: 2px solid pink;
  border-radius: 60px;
  padding: 20px;
  background-color: rgb(174, 216, 230);
}

#b-parent {
  position: relative;
  width: 200px;
  height: 100px;
}

#b {
  position: absolute;
  margin-left: 30px;
  margin-top: 20px;
  width: 200px;
  height: 100px;
  border: 3px dashed black;
  background-color: rgb(255, 191, 205);
}

#c {
  width: 150px;
  height: 70px;
  font-size: 10px;
  color: rgb(207, 14, 14);
  padding-top: 30px;
  margin-bottom: 20px;
  background-color: rgb(0, 128, 1);
}

#d {
  width: 150px;
  height: 100px;
  margin-top: 20px;
  margin-bottom: 20px;
  background-color: white;
}