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

body {
  font-family: 'Roboto', sans-serif;
  background-image: url('https://i.ibb.co/8DHtpCMQ/banner.png'); 
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  background-attachment: fixed;  
  display: flex;
  flex-direction: column;
  justify-content: center; 
  align-items: center;    
  text-align: center;
}