Safari on Mac Issues

Hi guys

Just wanted to check your opinion about this…

I found out that the Websites I make with Bricks are shown correctly from Safari 13 with Catalina 10.15 (year 2019). On an older system or Safari version, the CSS of the Website is not served properly. See Screenshot:

I noticed that all the sites I make (JS, CSS and Images, I use directly WebP as images) are being shown correctly from Safari 14 with Big Sur, which is from the year 2020.

My question is, should I just keep going and let the times roll by…? Or should I change all images to jpeg and png, that at leat the 2019ers can see them even the site looks broken?

Or did I do something so wrong building the site that old Safari cant read the CSS?