How to make a curve that connects edges?

I'm trying to build a stadium with Tinkercad, and right now I have the basic model: https://www.tinkercad.com/things/iO6JYyiZMRI-copy-of-design-a-stadium/edit (I used the layout from here:  https://blog.tinkercad.com/design-a-stadium )

What I want to do is, make somewhat of a curve that 'connects' the open spaces, so as to make the final model look like this: https://i.pinimg.com/originals/21/c9/d5/21c9d5e5e9087db6981be5dc839e1021.png 

As you can see, there are those curves at each corner. I want to create those. So can someone please help me? Thank you. I'm pretty new to Tinkercad. 


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