Styling on single product

Hey all you gurus out there! I’m looking for some help with styling the css on a woo commerce single product page. It seems simple but all my tests aren’t working out, so I’ve come to the brains trust for some help.

Okay so on the single product page, some of the entrys stretch the full width of the section, and some are forced smaller for some reason. The short description and category tags are spanning the full section, but the variations, variations desc and the cart/ qty buttons cannot? It’s probably simple, but, I cannot figure it out.

I’ll post some screenshots below with how it looks now, and how I’m trying to get it to look.

Thanks guys

Website: https://www.subscriptionboxaustralia.com/product/beauty-subscription-boxes/beautifully-well-box/

currently looks like: https://www.subscriptionboxaustralia.com/wp-content/uploads/2020/02/Snap-2020-02-06-at-14.29.49.png

Attempting to get it to look like: https://www.subscriptionboxaustralia.com/wp-content/uploads/2020/02/2.png

The desired behaviour is that the variations section, the variation description and the cart buttons will not only fill up half the space, but will fill the entire space, as the short description does, and is shown in my screenshots.

The page I need help with: [log in to see the link]