Post Grid Filter display options

Hi – I’m using post grid pro. I’ve set up a filterable post grid and i’m trying to change the display options so the unselected options also remain on the page but are faded out slightly. I want to maintain the grid and fade out the unselected items.

Here is the current post grid code:
<div class=”item item-1752 skin flat odd 1 mix” style=”display: none;”>

is it possible to change the
style=”display: none;”
to
style=”opacity: 0.4;”

so it would look like this
<div class=”item item-1752 skin flat odd 1 mix” style=”opacity: 0.4;”>

if this is possible? – if so, what file do i need to update?

thank you in advance