Replace form with div to avoid default button handling

main/index.html

@@ -140,7 +140,7 @@
         </div>
 
         <div class="card">
-            <form id="configForm" class="controls">
+            <div class="controls">
                 <div>
                     <label>Sample Rate (Hz)</label>
                     <input type="number" id="sampleRate" value="10000" min="1" max="83333">
@@ -171,9 +171,9 @@
                 </div>
                 <div>
                     <button id="resetBtn">Reset</button>
-                    <button id="powerOff"><a style="text-decoration: none; color: inherit" href="/poweroff">Power off</a></button>
+                    <button id="powerOff">Power off</button>
                 </div>
-            </form>
+            </div>
         </div>
 
         <div id="deltaPanel"></div>