Grey Box around thumbnails-NextGen Gallery

Hi ,

I am using NextGen Gallery to display pictures on my website. Everything is working fine except the “Grey Box” around the thumbnails. Also these images are coming vertically in a row. I want them to be adjusted horizontally without any spaces between images.

Gallery URL is : https://www.greedynet.com/apple-iphone-5-relaeased-the-biggest-and-most-beautiful-thing-to-happen-to-iphone-since-iphone/?pid=139

Thanks in advance.