body {
  background-color: #222;
  color: #ddd;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 300;
}
h1,
h2 {
  color: white;
  font-weight: 400;
  margin-bottom: 0;
}
.panel pre.prettyprint {
  font-size: 20px;
  text-align: left;
  width: auto;
  font-weight: normal;
  margin: 10px;
  border: none;
}
.prettyprint .linenums {
  padding: 0;
  list-style: none;
}
.prettyprint ol li {
  background-color: black;
}

.panel.red .prettyprint .linenums > li:nth-child(n + 7):nth-child(-n + 9),
.panel.gray .prettyprint .linenums > li:nth-child(10),
.panel.purple .prettyprint .linenums > li:nth-child(4),
.panel.green .prettyprint .linenums > li:nth-child(n + 6):nth-child(-n + 10) {
  background-color: #222;
}

.box {
  width: 100px;
  height: 80px;
  text-align: center;
  line-height: 80px;
  background-color: white;
  border-radius: 8px;
  color: #222;
  font-weight: 700;
  margin-left: 20px;
  will-change: transform;
}
.box.active {
  background-color: orange;
  border: 2px solid white;
}
.description,
.final {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px;
  min-height: 80vh;
}

.container {
  width: 500%;
  height: 100%;
  display: flex;
  flex-wrap: nowrap;
}

.panel {
  font-weight: 300;
}

code {
  padding: 0.1rem;
  background: #fff;
  color: #222;
  font-size: 1.5rem;
}

h1 code {
  font-size: 1.7rem;
}