/*visual*/
body 
 {background-color: white;
  color: black;
  font-family: Courier New;}

/*alignment*/
body 
 {line-height: 0;}
  
/
  {display: flex; 
  flex-direction: column; 
  justify-content: center; 
  align-content: center;}

/
  {display: flex;
  justify-content: center;
  align-content: center;      /* for multi-line flex container */
  margin: auto;}