html, body {
  margin:0;
  text-align: center;
}
header {
	height:10vh;
  /*text-align: center;*/
}
main {
	height:80vh;
	display:flex;
	justify-content: space-around;
	
}
footer {
	height:10vh;
  /* text-align: center; */
  font-size: 1.5vh;
}