Fix the embed issue with GrooveVideo's embed code. The ".groovevideo-widget-border-solid" class may change depending on widget settings, so make sure to get the correct class of the iframe's parent div and change if needed.

groove-video-embed-fix.css

<style>
/* parent of iframe */
.groovevideo-widget-border-solid {
    position: relative;
    padding: 56.25% 0 0 0;
    margin: 0;
}

/* iframe */
.groovevideo-widget-border-solid iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    margin: 0;
}
</style>