* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body, html{
  width:100%;
  height:100%;
  overflow: hidden;
  background: black;
}

body {
  top: 0;  
}

#canvas1 {
  position: absolute;
  place-self: center; 
  
  width: 100%;
  height: 100%;
  border: 3px solid black;
}