Border line

Hi!

I can´t remove the border in my website: http://pongobongo.es/categoria-producto/quito-pongo

I´ve tried several solutions posted in the support forum and it didn´t works.

The last thing I´ve tried was:
“In other options->styles->css customization

/* Thumbnails */
.ngg-gallery-thumbnail img, .ngg-thumbnail img {
background: none !important;
border: none !important;
padding: 0px;
}”

Any suggestion?

http://wordpress.org/plugins/nextgen-gallery/