html, body {
  font-family: sans-serif;
  font-size: 24px;
  line-height: 1.618em;
  margin: 0;
  padding: 0;
}

.warning {
  background: #ffa;
  border-bottom: 3px solid #660;
  color: #660;
  display: none;
  margin: 0;
  padding: 1em;
  text-align: center;
}
.es6-fail .warning {
  display: block;
}

textarea {
  box-sizing: border-box;
  display: block;
  width: 100%;
  height: 24em;
  font-size: 18px;
}

h1 {
  border-bottom: 3px dashed #ccc;
  margin: 3em 0 1.5em;
  padding-bottom: 1rem;
}

h2,
h3 {
  color: #333;
  margin-top: 2.4em;
}

blockquote {
  border-left: 3px solid #ccc;
  color: #666;
  font-size: 0.9em;
  padding-left: 1em;
}

code {
  background: #eff4f4;
  border-radius: 3px;
  color: #257;
  padding: 0 0.2em;
}

li {
  line-height: 1.2em;
}

.page {
  margin: 0 auto;
  max-width: 32em;
  padding: 0 1em;
}

.postscripts {
  border-top: 3px dashed #eee;
  background: #eee;
  background-clip: padding-box;
  font-size: 18px;
  line-height: 1.4em;
  margin-top: 8em;
  padding: 2em 5%;
}

.demo {
  border: 3px dashed #ccc;
  font-size: 18px;
  margin-top: 1em;
  padding: 0.5em 1em 1em;
}
.demo code {
  background: #ccc;
  color: #133;
  display: block;
  margin: calc(-0.5em - 3px) calc(-1em - 3px) 1em calc(-1em - 3px);
}

button,
input {
  font: inherit;
  padding: 0.2em 0.6em;
}

hr {
  border-width: 0;
  border-top: 3px dashed #ccc;
  display: block;
  margin: 3em 0;
}

.CodeMirror {
  border-left: 3px solid #cef;
  height: auto;
  font-size: 18px;
  line-height: 1.333em;
  padding: 0.333em 0.667em;
}
.CodeMirror-focused,
.CodeMirror:hover {
  background: #f7f7fa;
  box-shadow: 1px 1px 6px -1px rgba(0, 0, 64, 0.333) inset;
}