.planet {
  border: 2px solid black;
  border-radius: 50%;
  height: 250px;
  width: 250px;
  padding: 10px;
  margin: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

p {
  margin: 0;
}

.planet-name {
  font-weight: bold;
  font-size: 24px;
}

.planet-circumference,
.planet-distance {
  font-style: italic;
}

.planet-Earth {
  background: green;
}

.planet-Mars {
  background: red;
}

.search {
  padding: 10px;
  font-size: 16px;
}

.hide {
  display: none;
}