html {
  background: #efefef;
  height: 100%;
}

body {
  font-family: Georgia, sans-serif;
  line-height: 1.5;
  max-width: 900px;
  min-height: 100%;
  margin: 0 auto;
  padding: 20px;
  background: #fff;
  box-shadow: 0 0 5px 5px rgba(0, 0, 0, 0.2);
}

.planet {
  border: 2px solid black;
  border-radius: 50%;
  height: 325px;
  width: 325px;
  padding: 10px;
  margin: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

p {
  margin: 0;
  font-size: 12px;
}

.planet-name {
  font-weight: bold;
  font-size: 20px;
}

.planet-image {
  max-width: 50%;
}

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

.planet-Earth {
  background: green;
}

.planet-Mars {
  background: red;
}

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

.atmosphere-buttons {
  margin-top: 15px;
}

.hide {
  display: none;
}

button {
  margin: 5px;
  padding: 10px;
}

.currently-selected-button {
  background: black;
  color: orange;
}