body {
  margin: 0;
  padding: 0;
}

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

.vertical-center {
  min-height: 100%; /* Fallback for browsers do NOT support vh unit */
  min-height: 100vh; /* These two lines are counted as one :-) */
  display: flex;
  align-items: center;
}

#logo img {
  max-width: 636px;
  width: 90%;
  margin: 0 auto;
  padding: 0;
}