body {
  padding-top: 20px;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}

.container h1 {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 48px;
  font-weight: 700;
  letter-spacing: 2.28px;
  bottom: 0;
  margin-bottom: 10px;
  /*color: #222;*/
}

.container h2 {
  /*background-color: red;*/
  font-size: 26px;
  font-weight: 300;
  letter-spacing: 0.48px;
  margin: 0;
}


h2 {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 1em;
  font-weight: 400;
}

p {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}

.lead {
  font-weight: 300;
  letter-spacing: 0.48px;
  margin: 24px 0;
}

.footer {
  border-top: 1px solid #eee;
  margin-top: 40px;
  padding-top: 40px;
  padding-bottom: 40px;
}

/* Main marketing message and sign up button */
.jumbotron {
  text-align: center;
  background-color: transparent;
}
.jumbotron h1 {
  line-height: 1.1;
}
.jumbotron .btn {
  font-size: 21px;
  padding: 14px 24px;
}

/* Responsive: Portrait tablets and up */
@media screen and (min-width: 768px) {
  /* Remove the padding we set earlier */
  .masthead,
  .marketing,
  .footer {
    padding-left: 0;
    padding-right: 0;
  }
}

.jumbotron {
  padding-bottom: 0;
  margin-bottom: 20px;
}

.footer {
  border-top: none;
  margin: 10px;
  padding: 0;
  color: gray;
  text-align: center;
}

.hidden {
  visibility: hidden;
}

.demo h1 {
  text-align: center;
}

.demo h2 {
  text-align: center;
}

.container {
  max-width: 840px;
  margin: auto;
  /*background-color: red;*/
}

.container h1 {
  letter-spacing: -0.28px;
}

.container h2 {
  line-height: 1.28;
  margin-bottom: 30px;
}

.sample-files {
  margin: auto;

  list-style-type: none;
  margin: 0;
  padding: 0;
  font-weight:600;
  text-align: center;
}

.sample-files ul {
  /*display: flex;*/
  /*align-items: center;*/
  /*justify-content: center;*/
}

.sample-files li {
  list-style-type: none;
  display: inline-block;
}

.sample-files a {
  display: inline-block;
  border-radius: 18px;
  /*border: 1px solid #ccc;*/
  padding: 10px;
  margin: 4px;
  margin-bottom: 6px;

  text-align: left;
  text-decoration: none;
  color: #007AFF;
  width: 60px;
  height: 60px;

  background: #007AFF;
  color: white;
  /*border: 1px solid #666;*/
}

.links {
  font-size: 18px;
  margin: auto;
  text-align: center;
}

.links a {
  padding: 4px;
}