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.iframe-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 比例 * /
    height: 0;
    overflow: hidden;
}

.iframe-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

jQuery(document).ready(function($) {
    function resizeIframe() {
        $('iframe').each(function() {
            $(this).css('height', 
                $(this).width() * 9/16 + 'px'
            );
        });
    }
    
    resizeIframe();
    $(window).resize(resizeIframe);
});