*,
::after,
::before,
::backdrop {
  box-sizing: border-box;
  border: 0 solid;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;

  max-width: 600px;
  margin: 50px auto;
  padding: 0 10px;

  font-size: 1.1em;

  a {
    color: #0000EE;
  }

  h1 {
    text-align: center;
  }

  p {
    margin: 12px 0;
    line-height: 1.3em;
  }

  ul, ol {
    padding-left: 40px;
    margin: 12px 0;
  }

  li {
    margin: 6px 0;
  }
}