Space Between Post

I am looking for a way of having space between each video thumbnail.

I have added this to the custom css of my website but it’s not working

.panel-grid .youtube_channel.responsive .ytc_video_container {
width: 50%!important;
padding: 0 10px;
box-sizing: border-box;
}
p:empty{display:none;}

Is there any other way I can solve this issue?

Thank you

The page I need help with: [log in to see the link]