Original (Before) in 4:3 Format

After (Added Matching Green Right & Left Margins in 16:9 Format)

Here’s What the Embedded Video Looks Like with New Thumbnail

<iframe width="1268" height="600" src="https://www.youtube.com/embed/Un8xwiYF9eE?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe>

Here’s What the Other Videos Look Like for Comparison

<iframe width="1268" height="600" src="https://www.youtube.com/embed/EkmWltkz9u0?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe> <iframe width="1268" height="600" src="https://www.youtube.com/embed/6tiFx1AGKfo?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe> <iframe width="1268" height="600" src="https://www.youtube.com/embed/gOxBFdtfe4s?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe>