Add distance default value

site2/index.html

@@ -114,7 +114,7 @@
             <div class="form-check">
                <div class="input-group mb-3">
                   <span class="input-group-text" id="distanza_label">Distanza</span>
-                  <input type="number" id="distanza" class="form-control" id="basic-url" aria-describedby="distanza">
+                  <input type="number" id="distanza" value="2" class="form-control" id="basic-url" aria-describedby="distanza">
                 </div>
             </div>
          </div>