Customize checkboxes

Hi,

I just bought the plugin and I added one form with a "Pricing" field "Option". For this option I gave 3 values, and in the CSS Class name I indicated "check_03".

Then, in my CSS I added at the bottom the following code:

/* estilo 03 */
input[type=checkbox].check_03 {display: none;}
input[type=checkbox].check_03 + label {
background: #fff;
display: inline-block;
width: 160px;
height: 45px;
background: url(/images/check_03.png) 0px 0px no-repeat;
text-indent: -1000em;
}

input[type=checkbox].check_03:checked + label { background: url(/images/check_03.png) 0px -45px no-repeat;}

I mean to have checkboxes like the third one of: http://www.cmacias.com/wp-content/uploads/demos/checkbox/index.html

But I don't actually get it done.

What I am doing wrong?

Thanks.

Yes, it is here: http://bit.ly/11fkeCD

Thanks.