html {
  height: 100%;
  font-size: 80%;
}

body {
  height: 100%;
  background-color: #020202;
  overflow: hidden;
  text-align: center;
}

.container {
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

.moon {
  display: inline-block;
  width: 19rem;
  height: 19rem;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 0.25rem;
}

.moon:first-of-type .light {
  animation-delay: -2.5s;
}

.moon:last-of-type .light {
  animation-delay: -17.5s;
}

.light {
  box-sizing: border-box;
  width: 20rem;
  height: 20rem;
  background-color: #111;
  border-radius: 50%;
  animation: cycle 20s linear infinite reverse;
  animation-delay: -10s;
  filter: blur(0.5rem);
}

.texture {
  width: 19rem;
  height: 19rem;
  border-radius: 50%;
  position: absolute;
  margin-top: -20rem;
  background-image: url(../img/moon_3.jpg);
  background-position: center center;
  background-size: 195%;
  background-repeat: no-repeat;
  mix-blend-mode: multiply;
}

.sphere {
  width: 19.75rem;
  height: 19.75rem;
  border-radius: 50%;
  box-shadow: inset 0 0 10rem #000, inset 0 0 5rem #000, inset 0 0 3rem #000;
  position: absolute;
  margin-top: -20.3rem;
  margin-left: -0.3rem;
  filter: blur(0.1rem);
}

@keyframes cycle {
  0% {
    border-left: 0 solid #fff;
    border-right: 10rem solid #111;
    background-color: #111;
    transform: rotate(-10deg);
  }
  24.9999% {
    background-color: #111;
  }
  25% {
    border-left: 10rem solid #fff;
    border-right: 10rem solid #111;
    background-color: #fff;
  }
  50% {
    border-left: 0 solid #fff;
    border-right: 0 solid #111;
    background-color: #fff;
    transform: rotate(0deg);
  }
  50.0001% {
    border-left: 0 solid #111;
  }
  74.9999% {
    background-color: #fff;
    border-right: 0 solid #fff;
  }
  75% {
    border-left: 10rem solid #111;
    border-right: 10rem solid #fff;
    background-color: #111;
  }
  100% {
    border-left: 10rem solid #111;
    border-right: 0 solid #fff;
    background-color: #111;
    transform: rotate(10deg);
  }
}