html body {
  font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #333;
  background-color: #fff;
  max-width: 790px;
  margin: 0 auto;
  padding: 3em 2em;
  word-wrap: break-word;
}

h1 {
  font-size: 1.8em;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 1em;
  color: #000;
}

h2 {
  font-size: 1.3em;
  font-weight: 600;
  margin-top: 2em;
  margin-bottom: .6em;
  color: #000;
}

img {
  max-width: 100%;
  margin-bottom: 1em;
}

a {
  color: #08c;
  text-decoration: none;
}

a:hover {
  color: #00a3f5;
}

hr {
  height: 1px;
  margin: 2.5em 0;
  background-color: #d6d6d6;
  border: 0;
}

ul {
  padding-left: 1.5em;
  margin: 0 0 1em;
}

li {
  margin-bottom: .8em;
}

code {
  font-family: Consolas, Menlo, Monaco, 'Courier New', monospace;
  font-size: .9em;
  background-color: #f0f0f0;
  border-radius: 3px;
  padding: .2em .4em;
}

@media screen and (max-width: 450px) {
  html body {
    font-size: 14px;
    padding: 2em 1.2em;
  }
}