fix

class/phonefield.php

@@ -6,7 +6,7 @@ class PhoneField extends Field
         // Todo, if isset($_POST[$this->name]) && !$this->validate() => Show a error msg explanation for this line.
         $html = '<div class="form-group">
                     <label for="form'.$this->name.'">'.$this->label.'</label>
-                    <input type="tel" name="'.$this->name.'" value="'.$this->value.'"> 
+                    <input type="tel" class="form-control" name="'.$this->name.'" value="'.$this->value.'"> 
                 </div>';
         return $html; 
     }