updated time

static/index.html

@@ -11,12 +11,14 @@
     main { text-align: center; padding: 2rem; }
     .value { font-size: clamp(3rem, 12vw, 8rem); font-weight: 800; line-height: 1; }
     .unit { margin-top: 0.75rem; font-size: 1.25rem; color: #94a3b8; }
+    .updated-at { margin-top: 0.5rem; font-size: 0.875rem; color: #64748b; }
   </style>
 </head>
 <body>
-  <main>
-    <div class="value">{{.Watts}}</div>
-    <div class="unit">watts</div>
-  </main>
+    <main>
+      <div class="value">{{.Watts}}</div>
+      <div class="unit">watts</div>
+      <div class="updated-at">Last updated: {{.UpdatedAt}}</div>
+    </main>
 </body>
 </html>