* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --ash-gray: rgba(180, 184, 171, 1);
  --prussian-blue: rgba(21, 50, 67, 1);
  --indigo-dye: rgba(40, 75, 99, 1);
  --earth-blue: rgba(128, 221, 252, 1);
  --alabaster: rgba(228, 230, 225, 1);
  --glow: rgba(255, 244, 249, 0.5);
}

body {
  background-image: radial-gradient(circle at center, var(--prussian-blue) 10%, var(--indigo-dye) 70%, var(--prussian-blue) 100%);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.space {
  position: relative;
  width: 200px;
  height: 200px;
}

.earth {
  position: absolute;
  width: 100px;
  height: 100px;
  top: 50%;
  left: 50%;
  background-color: var(--earth-blue);
  background-image: radial-gradient(circle at 30% 30%, var(--earth-blue) 10%, rgba(40, 75, 99, 0.7) 70%);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(128, 221, 252, 0.5), inset 0 0 10px rgba(40, 75, 99, 0.3);
  transform: translate(-50%, -50%);
}

.orbit {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: orbit 5s linear infinite;
}

.moon {
  position: absolute;
  width: 30px;
  height: 30px;
  top: 0;
  left: 50%;
  background-color: var(--alabaster);
  background-image: radial-gradient(circle at 40% 40%, var(--alabaster) 20%, var(--ash-gray) 80%);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--glow);
  transform: translateX(-50%);  
}

@keyframes orbit {
  0% {
    transform: rotate(0deg) translate(-50%, -50%);
  }
  100% {
    transform: rotate(360deg) translate(-50%, -50%);
  }
}

@media (max-width: 480px) {
  .space {
    width: 150px;
    height: 150px;
  }
  .earth {
    width: 75px;
    height: 75px;
  }
  .orbit {
    width: 150px;
    height: 150px;
  }
  .moon {
    width: 22px;
    height: 22px;
  }
}