* {
  margin: 0;
  color: #ffffff;
  background-color: #303030;
}

a {
  color: #33bbff;
  text-decoration: none;
}

main {
  max-width: 800px;
  margin: auto;
}

header {
  text-decoration: none;
  margin-top: 30px;
}

article {
  margin-top: 20px;
}

footer {
  margin-top: 20px;
}

.center {
  display: flex;
  flex-direction: column;
  align-items: center;
}
