Image Borders
To make rounded corners:
https://round-corner.imageonline.co/
https://pinetools.com/round-corners-image
The image is in Google Drive. It has to be on the web somewhere that you can get its URL
I got the image URL and used this code in the code section of the embed function:
<iframe src="https://drive.google.com/file/d/0B28Gtf1n8u8DaFBSVDFuQU92XzQ/preview" width="300" style="border: 10px solid black;" ></iframe>
<iframe src="https://drive.google.com/file/d/0B28Gtf1n8u8DaFBSVDFuQU92XzQ/preview" width="300" style="border: 10px solid red;" ></iframe>
<iframe src="https://drive.google.com/file/d/0B28Gtf1n8u8DaFBSVDFuQU92XzQ/preview" width="300" style="border: 10px dashed gray;" ></iframe>
<iframe src="https://drive.google.com/file/d/0B28Gtf1n8u8DaFBSVDFuQU92XzQ/preview" width="300"
style="border: 2px solid red; border-radius: 12px; padding: 5px;" ></iframe>