What Is This Vertical Transparent Line Appearing Only On Safari Mac?

I've designed this page on Google Chrome, and it displays nicely. However if you check it on Safari Mac (Safari Windows displays it well) and it has a strange vertical line : The

Solution 1:

As per this reply: Stray vertical line above 965 pixels with border radius in Safari

You should add -webkit-background-clip: padding-box; to your containing class.