body {
  background-color: #f9f9f9;
  color: #404040;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  font-weight: 300;
  line-height: 2;
  margin-left: auto;
  margin-right: auto;
  margin-top: 4rem;
  max-width: 50rem;
}
h1 {
  font-size: 1.4rem;
  font-weight: 300;
  margin: 0;
}
span {
  background: #efefef;
  color: #606060;
  font-family: monospace, monospace;
  font-size: 1em;
  padding: 0.3em;
}
a { 
  color: #222; 
  border-bottom: 1px solid #c2c2c2;
  padding-bottom: 0.2rem;
  text-decoration: none;
}
a:visited { 
  color: #222; 
}
a:hover { 
  color: #000; 
}

img {
  margin-top: 1em;
  max-width: 350px;
}

@media screen and (max-width: 860px) {
  body {
    margin-top: 0rem;
    padding: 1rem 2rem;
  }
  img {
    max-width: 100%;
  }
}