html, body {
  height: 96vh;
  width: 96vw;
  margin: auto;
}
body{
  background-color: #000000;
  background-repeat: no-repeat;
  background-position: center top; 
  background-attachment: fixed;
  color: skyblue;
  display: flex;
  flex-direction: column; 
  justify-content:center;
}
div.logo {
  min-width: 60vw;
  min-height: 30vh;
  color: skyblue;
  font-size: 10vw;
  text-align: center;
  display: flex;
  flex-direction: column; 
  justify-content:center;
  margin: auto;
  border-radius: 25vh 5vh 25vh 5vh;
  background-color: steelblue;
}