@import url("https://fonts.googleapis.com/css2?family=Baskervville+SC&display=swap");
body {
  margin: 0;
  padding: 0;
  font-family: "Baskervville SC", serif;
  font-weight: 400;
  font-style: normal;
}
.center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

h1 {
  text-align: center;
}

ul {
  margin: 0;
  padding: 0;
  position: relative;
  width: 400px;
  height: 240px;
  overflow: hidden;
  border-bottom: 1px solid rgba(0, 0, 0, 0.2);
}

ul li {
  list-style: none;
  border-radius: 50%;
  border: 15px solid #000;
  position: absolute;
  top: 100%;
  left: 50%;
  border-bottom-color: transparent !important;
  border-left-color: transparent !important;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  animation: animate 5s infinite alternate;
  transform: translate(-50%, -50%) rotate(-45deg);
}

ul li:nth-child(1) {
  width: 60px;
  height: 60px;
  border-color: #ff0000;
  animation-delay: 0.2s;
}

ul li:nth-child(2) {
  width: 90px;
  height: 90px;
  border-color: #ff7f00;
  animation-delay: 0.4s;
}
ul li:nth-child(3) {
  width: 120px;
  height: 120px;
  border-color: #ffff00;
  animation-delay: 0.6s;
}
ul li:nth-child(4) {
  width: 150px;
  height: 150px;
  border-color: #00ff00;
  animation-delay: 0.8s;
}
ul li:nth-child(5) {
  width: 180px;
  height: 180px;
  border-color: #0000ff;
  animation-delay: 1s;
}
ul li:nth-child(6) {
  width: 210px;
  height: 210px;
  border-color: #4b0082;
  animation-delay: 1.2s;
}
ul li:nth-child(7) {
  width: 240px;
  height: 240px;
  border-color: #9400d3;
  animation-delay: 1.4s;
}

@keyframes animate {
  0% {
    transform: translate(-50%, -50%) rotate(-45deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(315deg);
  }
}