/* main styles */
*, *:before, *:after {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  font-size: 100%;
  color: #444;
  background-color: #fff;
}

main {
  margin-bottom: 2em;
}

article {
  max-width: 40em;
  padding: 0 4em;
  margin: 0 auto;
}

h1, h2 {
  font-weight: normal;
  margin-top: 1em;
}

p, a {
  margin-top: 1em;
}

h2 + p {
  margin-top: 0;
}

ul, ol {
  margin: 1em 0 0 2em;
}

li {
  margin-top: 0.5em;
}

pre {
  white-space: pre;
  padding: 2px 6px;
  margin-top: 1em;
  background-color: #ddd;
  border-radius: 3px;
  overflow: auto;
}

code {
  font-family: monospace;
  font-size: 1em;
}

img {
  max-width: 100%;
}

.feature {
  font-size: 1.2em;
  text-align: center;
  padding: 1em 2em;
  background-color: #9de;
  border: 2px solid #999;
}

.box {
  display: flex;
  justify-content: space-around;
  list-style-type: none;
  margin: 2em 0;
}

.box li {
  flex-basis: 1 1 30%;
  margin: 0;
  padding: 1em;
  background-color: #9de;
  border: 2px solid #999;
}