add a button

static/css/main.css

@@ -16,3 +16,8 @@ td {
 input.input_margin{
     margin-right: 6%;
 }
+button .left{
+    float:right;
+}
+
+

templates/wifi.html

@@ -28,9 +28,11 @@
             {% endfor %}
 		</tbody>
 	</table>
-    <div class="col text-center">
-    <button type="button" id="button" class="btn btn-danger btn-lg">confirm</button>
+
+    <button type="button" id="prev" class="btn btn-danger btn-lg pull-left">previous</button>
+    <button type="button" id="button" class="btn btn-danger btn-lg pull-right">confirm</button>
     </div>
+    <div> </div>
     </div>
 {% block footer %}
 <footer class="footer" >
@@ -67,6 +69,9 @@
         $('#button').click(function(){
             window.location.href= "http://localhost:8080/wifi_select/"+_ssid;
         });
+        $('#prev').click(function(){
+            window.location.href = "http://localhost:8080/"
+        });
     </script>
 
 {% endblock %}