@keyframes appear {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

.appear {
  animation: appear 1s ease-in forwards;
  opacity: 0;
}

.ball {
  border-radius: 50%;
  display: block;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

.ball > div {
  border-radius: 50%;
  height: 100%;
  position: absolute;
  width: 100%;
}

.ball > div > span {
  background: #fff;
  border-radius: 50%;
  height: 60%;
  left: 50%;
  line-height: 175%;
  position: absolute;
  text-align: center;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 60%;
}
