selected color on radio characteristic

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.4.45

Hi,
I make this custom radio selection:
www.hikashop.com/support/documentation/i...isplay-by-color.html

I would like to make a border on select color and size. I'm not CSS expert and I'm trying around with:
.hikashop_filter_characteristics_table td.inputbox input[type="radio"]:checked+label{border: 2px solid}

I need help.
Tnx
Danilo

Hi,
works ok for color img not for size (is a normal text characteristic).
I try with:
.hikashop_product_characteristics_table input[type="radio"]:checked + label
but doesn't work.

Tnx
Danilo