Added a footer.

assets/css/style.css

@@ -40,6 +40,10 @@ header {
     background-image: linear-gradient(2rad, #155799, #159957);
 }
 
+footer > hr {
+    background: #111;
+}
+
 p {
     padding: 0em 0.5em;
 }
@@ -109,3 +113,9 @@ p {
 .button + .button {
     margin-left: 1rem;
 }
+
+.power-indicator {
+    background-image: radial-gradient(ellipse, red 60%, transparent 75%);
+    width: 2.25rem;
+    height: 0.9rem;
+}

index.html

@@ -17,5 +17,11 @@
     <section class="page-content">
       $body$
     </section>
+    <footer>
+      <hr>
+      <div align="center">
+        <p class="power-indicator" />
+      </div>
+    </footer>
   </body>
 </html>