Hello,
1) Please try to use this custom CSS code:
.single-product .product-information-inner *:not(img) {text-align: center !important;}
.single-product .product-information-inner ul {display: inline-block;}
.single-product .product-information-inner ul li {text-align: left !important;}
.single-product .product-information-inner table {margin-left: auto; margin-right: auto;}
.single-product .product-information-inner .product-share {justify-content: center;}
.single-product .product-information-inner .quantity {float: none !important;}
2) Provide URL of a page where the border should be added.
3)
.single-product .pswp__bg {
opacity: 0.5 !important;
}
4) Provide a URL and give me more details about the desired result.
Regards