body {
  padding: 0;
  margin: 0;
  height: 100vh;
  background: linear-gradient(135deg, #8fc7f1, #7173f5);
  overflow: hidden;
}
#my-div {
  width: 6em;
  height: 6em;
  background-color: #ffffff;
  position: absolute;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  box-shadow: 0 0 20px rgba(16, 0, 54, 0.2);
  transition: 0.1s ease-out;
}