Hello,
1) Please add this code in style.css of the Child Theme.
.single-product .label-icon {
z-index: 10000;
}
2)
i found review star label should also appear on the single product image, on the right top corner, but i could not load mine on it either.
Its working now. See screenshot: http://prntscr.com/bktgqp
3)
Additionally, how to make the star look bigger and change to other color, e.g red, yellow, rather than light gray now??
In this case you should edit the star.png file with your own style then upload the file via FTP into wp-content/themes/blanco/woocommerce/images/ folder.
Regards,
Robert Hall















