* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  position: relative;
  font-family: "Open Sans", sans-serif;
}

.background-dark {
  background-color: #171618;
  color: #fff;
  overflow: hidden;
}

header {
  display: flex;
  justify-content: center;
  align-items: center;
}

header a {
  justify-self: flex-start;
}

header img {
  height: 50px;
  margin: 10px;
}

header h1 {
  display: inline-block;
  text-align: center;
  margin: 0 20px;
}

h6 {
  font-size: 14px;
  margin: 8px 0;
}

ol ol {
  margin-left: 30px;
}

ol li {
  margin: 8px;
}

main {
  width: 85%;
  margin: 20px auto;
}

.author {
  font-size: 0.7em;
  text-align: center;
}

.author a {
  color: inherit;
}

footer {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

footer span {
  margin: 5px 10px;
}

footer a:link,
footer a:visited {
  color: inherit;
}