You can make make round corner media element(image, embed video, etc) by Border Radius options, the options are available on Single Image, Slider, Embed, Grid, and Masonry Grid module.
The border radius options are available from BM Content builder v 3.15
It works like this:
The border radius options are available on the Advanced settings. The Enable Corner Radius should be set as ON, then the 2 groups of input-boxes will display, the 1st group is for desktop, and the 2nd group is for mobile layout.
You need to enter a number for each box, each number is for one corner(Top Left, Top Right, Low Right, Low Left) of an element. The number is a length for the corner, You can enter a enough big number like 999.
