Please note: you can add round corners to videos in Semplice 7 with no need to use custom code. If you're on an older version of Semplice, you can upgrade here
Note: We do not provide support for custom code or scripts.
Add this CSS under "Look & Feel" > "Edit Custom CSS" on the page containing the video:
.rounded-border .mejs-container, .rounded-border .mejs-container * { border-radius: 20px !important; }Under "Miscellaneous" > "Classes", add this class name: rounded-border
To apply this globally, add the CSS under "Customize" > "Advanced".