html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: Consolas, Menlo, Monaco, Lucida Console, Liberation Mono,
    DejaVu Sans Mono, Bitstream Vera Sans Mono, Courier New, monospace, serif;
}

.main {
  display: flex;
  flex-direction: column;
  padding: 20px;
  margin-left: 20px;
}

.subheading {
  margin-bottom: 15px;
}

a {
  text-decoration: underline;
}

li {
  margin: 10px 0;
}

iframe {
  outline: none;
  border: 1px solid grey;
  width: 640px;
  height: 360px;
}