#container {
  margin: 1rem;
  width: 500px;
  height: 500px;
  position: relative;
  border: 1px solid #000;
}

.ball {
  width: 20px;
  height: 20px;
  position: absolute;
  border-radius: 50%;
  background-color: red;
}/*# sourceMappingURL=main.css.map */