.art_yt{position:relative;display:block;margin-bottom:20px}.left{text-align:left}.center{text-align:center}.right{text-align:right}.none{display:none}.art_yt.alignleft{margin-left:0;margin-right:1em}.art_yt.alignright{margin-left:1em;margin-right:0}.ai-iframe-container{position:relative;margin:1em 0;padding-bottom:56.25%;padding-top:30px;height:0}.ai-iframe-container iframe,.ai-iframe-container object,.ai-iframe-container embed{position:absolute;top:0;left:0;width:100%!important;height:100%}