Hello, Farcela,
1/ It seems that we missed a few more options for border styles and border colors to add for that element. We will add them in the next theme update and already uploaded them in core files on your web-site -> https://prnt.sc/5YC9taUe8d3V
2/ There is no good coding solution for that case. You may align items by center using next code snippet:
.bought-together-products .swiper-wrapper {
align-items: center;
}
Let us know if it helped or if you have any further questions or concerns. We are always here to help.
Kind Regards,
8theme team