Featured Boxes on Landing Page – grayscale

Hi, I’m using the animated version of the featured boxes for my landing page and am trying to work out how to alter the CSS so that the image shown is in full colour, rather than greyed out but I can’t seem to find the right options.
Adding
.lp-boxes-animated .lp-box .lp-box-image > img {
-webkit-filter: none;
filter: none;
}
gives it a bit of colour but it still looks like there is a filter over the top making the image much darker than on the hover option. Could you let me know how to remove this, please?
Thanks!

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