Hello,
Thanks for using our theme.
1/ One of these icons can be used https://xstore.8theme.com/xstore-icons/
for example, add the next code in Theme options > Theme custom CSS > Global:
.single-product .single_add_to_cart_button:before {
content: "\e93e" !important;
}
2/
.single-product .pswp__bg {
background: white;
}
.single-product .pswp__caption {
display: none;
}
Regards