html {
  font-size: 10px;
}
body {
  color: #555;
  background-color: #111;
  text-align: center;
  align-items: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  height: 100vh;
}
.logo {
  width: auto;
  height: auto;
  display: block;
  max-width: 80%;
}