html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: Arial;
  font-size: 1.1em;
}

input, button {
	font-family: Arial;
  font-size: 1.1em;
	box-sizing: border-box;
	height: 2em;
	padding: 0.3em;
}

#main {
	height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#result {
	display: block;
	max-width: 80%;
	margin-top: 1em;
}