groove-video-groove-member-video-size-fix.html

<style>
div[class^='groovevideo-widget-inner'] {
    position: relative;
    padding-top: 56.25%; /* Change to 100% for square video, or (height/width) x 100 */
}    

iframe.iframeClasses {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}
</style>