video field: how to insert space between one video and another

In video field video inserted with "link" mode (youtube i-frames and so on)

have no space one after the other (if more than one video is inserted)

I tried to modify

components/com_cobalt/fields/video/tmpl/output/default.php template

by creating a custom template, but I am not sure where to insert a

div to create a space between one video and another one

this is the template code

<div id="video-block<?php echo $key;?>">

    <div id="destr<?php echo $key;?>" class="video-block" style="display: none;"><div id="mediaplayer<?php echo $key;?>"></div></div>

    <div id="htmlplayer<?php echo $key;?>">

        <div class="progress progress-success progress-striped">

            <div class="bar" style="width: 100%"><?php echo JText::_('V_LOADING');?></div>

        </div>

    </div>



</div>

Just to see I tried to insert a

here and there, but it doesn't work...

any suggestion?