corner for vanity not square - what to do

I have a classic one here, but may have options. I have a vanity that came with a top. It doesn't fit square into the corner. I either make it flush along the left side and expose a 13/16" gap along the back right of the vanity, or I have a 7/16" gap on the left side. I have attached pics. It came with a backsplash, no sidesplash.

Thanks!

https://preview.redd.it/1ur71obrl5ig1.jpg?width=3024&format=pjpg&auto=webp&s=959947cb3477c5587348913cae767bebfb92995c

https://preview.redd.it/qfxa67i2m5ig1.jpg?width=4284&format=pjpg&auto=webp&s=986b23b364c6de22cebc9b562c29e3a6530e19d5

https://preview.redd.it/18icaao3m5ig1.jpg?width=3024&format=pjpg&auto=webp&s=17e186b75a736405c4b4816a2eb22d396e7576be