小编Nic*_*ole的帖子

.circle__box {
  width: 200px;
  height: 200px;
  margin: 50px auto;
  position: relative;
}

.circle__wrapper {
  width: 100px;
  height: 200px;
  position: absolute;
  top: 0;
  overflow: hidden;
}

.circle__wrapper--right {
  right: 0;
}

.circle__wrapper--left {
  left: 0;
}

.circle__whole {
  width: 160px;
  height: 160px;
  border: 20px solid transparent;
  border-radius: 50%;
  position: absolute;
  top: 0;
  transform: rotate(-135deg);
}

.circle__right {
  border-top: 20px solid teal;
  border-right: 20px solid teal;
  right: 0;
  animation: circleRight 5s linear forwards;
}

.circle__left {
  border-bottom: 20px …