<html>
	<head>
		<style>
			body, input, button {
				font-family: Courier New, sans-serif, fixed;
				font-size: 1em;
			}

			.def {
				margin-top:20px;
				margin-left:100px;
			}
			.def2 {
				margin-top:20px;
				margin-left:100px;
				min-height:20px;
			}
			.def3 {
				margin-top:30px;
				margin-left:100px;
			}

			.defx {
				margin-top:10px;
			}

			.result {
				background-color: lightgreen;
				color: black;
			}

			td {
				min-width : 20px;
				text-align: center;
			}

			.default {
			