What Mac do you have?
What OS version do you have?
What version of Safari?
It looks like web content advancing beyond your browser's ability to render it. If so, the solution is an upgrade. Depending on the age of your Mac, this could mean an OS upgrade that will allow you to run a newer browser, or it could mean that to solve it you need a newer Mac that can run the newer OS that supports the newer browser. Yeah, it's a racket.
Or, if you're really lucky, it can be solved by changing some setting in the browser that someone even geekier will know about. Keep checking back!
