Redesign web part a bit

clover/www/index.html

@@ -1,5 +1,11 @@
+<style>
+	body { font-family: sans-serif; }
+	main { max-width: 600px; margin: 50px auto; }
+</style>
+
 <title>Clover Drone Kit Tools</title>
 
+<main>
 	<h1>Clover Drone Kit Tools</h1>
 
 	<ul>
@@ -13,6 +19,7 @@
 	</ul>
 
 	<div class="version"></div>
+</main>
 
 <script type="text/javascript">
 	document.querySelector("#wvs").href = location.protocol + '//' + location.hostname + ':8080';
@@ -22,7 +29,7 @@
 	fetch('clover_version').then(function(response) {
 		if (response.status !== 200) return;
 		response.text().then(function(text) {
-			document.querySelector('.version').innerHTML = 'Version: ' + text;
+			document.querySelector('.version').innerHTML = 'Version: <code>' + text + '</code>';
 		});
 	});
 </script>