* {
  box-sizing: border-box;
}

/* planets */

.planets {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* planets */

.planet {
  width: 50%;
  padding: 20px;
}

@media (min-width: 1200px) {
  .planet {
      width: 25%;
  }
}

.planet-link {
  color: #000;
}

.planet-link:hover {
  color: #999;
}

.planet-image {
  width: 100%;
  margin-bottom: 5px;
}

.planet-name {
  font-weight: bold;
  font-size: 20px;
  margin-top: 0;
  margin-bottom: 5px;
}

.planet-details {
  font-style: italic;
  font-size: 12px;
  margin: 0;
}