Tweak styling for 'new watch' form

backend/static/css/styles.css

@@ -175,5 +175,16 @@ color: #fff;
 }
 
 .pure-form label  {
-font-weight: bold;
-}
+  font-weight: bold;
+}
+
+#new-watch-form {
+    background: rgba(0,0,0,.05);
+    padding: 1em;
+    border-radius: 10px;
+    margin-bottom: 1em;
+}
+#new-watch-form legend {
+    color: #fff;
+}
+

backend/templates/watch-overview.html

@@ -4,9 +4,9 @@
 
 <div class="box">
 
-    <form class="pure-form" action="/api/add" method="POST">
+    <form class="pure-form" action="/api/add" method="POST" id="new-watch-form">
         <fieldset>
-            <legend>Add new change detection watch</legend>
+            <legend>Add a new change detection watch</legend>
             <input type="url" placeholder="https://..." name="url"/>
             <input type="text" placeholder="tag" size="10" name="tag"/>
             <button type="submit" class="pure-button pure-button-primary">Watch</button>