I am a firm believer in maintaining the W3C standards on my website. I have done a relatively good job until here recently. I have installed two plugins which do not meet the current W3C CSS standards.
The NextGEN Gallery is one of them. If you look here you can see the http://www.sapphiresolutionsltd.com/wp-content/plugins/nextgen-gallery/shutter/shutter-reloaded.css?ver=1.3.0 file has several issues. All the issues are related to “OPACITY” which you have chosen to use in your css.
I think this should be something easy for you to fix.
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