Right sidebar content goes outside body?

Hello

The content on my right sidebar is going outside of the body. Don’t know why it’s doing this, it wasn’t like this before. I’ve noticed that if I check my site with the browser inspect element and remove a ‘property:value’ it’s goes back to normal. The ‘property:value’ is –

*{box-sizing: border-box;}

I’m pretty sure I’ve never used that ‘property:value’ in my custom style.css page. I can only remove it from the inspect element page, i have not idea how to get rid of it in my CSS. Can anyone help? Thanks!

Here is the page where you can see the problem. [Fair Warning: website is adult based – NSFW]