html, body {
  height: 100%;
  margin: 0;
}

.page-center {
  display: flex;
  /*border: black 1px solid;*/
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  width: 100%;
}

.logo-center {
  display: inline-block;
  /*border: green 1px solid;*/
}

.logo-center img {
  display: block;
  /*border: red 1px solid;*/
  width: min(70vw, 500px);
  height: auto;
}