div.choix_4 input[type=radio]:checked + label {    background-color: #0f0; }


div.choix_3 input[type=radio]:checked + label {    background-color: #00f; }


div.choix_2 input[type=radio]:checked + label {    background-color: #f90; }


div.choix_1 input[type=radio]:checked + label { background-color: #f00; }