.video-wrapper {
        width: 1000px;
        position: relative;
        margin: 0 auto;
        /*border: 1px solid green;*/
    }

    .video-standard {
        float: left;
        height: 270px;
        width: 480px;
        border: 1px solid #000;
        margin: 10px;
    }

    iframe {
        width: 100%;
        height: 100%;
    }


    @media (max-width:480px) {

        .video-standard {
            float: none;
            width: 480px;
            margin: 0 auto;
            padding-bottom: 10px;
        }
    }

    .clearfix:before,
    .clearfix:after {
        content: " "; /* 1 */
        display: table; /* 2 */
    }

    .clearfix:after {
        clear: both;
    }