html,
body {
  width: 100%;
  height: 100%;
}

body {
  color: #f5f6fa;
  background-color: #353b48;
  width: 100%;
  height: 100%;
  background-attachment: fixed;
}

main {
  text-align: center;
  margin-top: 100px;
}

.logo {
  margin-bottom: 50px;
}

.hidden {
  visibility: hidden;
}