Widget Button hidden.

Hi,

I put widget in footer of my website. But "Subscribe now" Button doesn't show. If i hover mouse cursor on the right side of input field then a blue box shown. I found followng code in widget.php

<span id="newsletters_buttonwrap">
                <input <?php echo $Html -> tabindex($widget_id); ?> type="submit" class="button btn btn-primary" name="submit" value="<?php echo esc_attr(stripslashes(__($instance['button']))); ?>" id="<?php echo $widget_id; ?> button" />
              </span>

but nothing seems wrong with this.

Could you help me with this?

Thanks