Edit in JSFiddle

$(function() {
    $('#Choix input').change(function(){
        var id = $(this).attr('id');
        console.log(id);
        $('#Choix label').removeClass('active');
        $('#Choix label[for=' + id + ']').addClass('active');
    })
});
<form>
	<div id="Choix">
		<label for="Choix1">Choix 1</label>
		<input id="Choix1" type="radio" name="choix" value="1" />
		<label for="Choix2">Choix 2</label>
		<input id="Choix2" type="radio" name="choix" value="2" />
	</div>
</form>
body{
    font-family: "lato";
}
#Choix input{
    display:none;
}
#Choix label{
    display:inline-block;
    text-align:center;
    padding:20px 27px;
    cursor:pointer;
    border: rgb(196, 196, 196) 1px solid;
    color:rgb(86, 90, 92);
    background:white;
}
#Choix label:hover{
    background:rgb(204, 228, 231);
}
#Choix label.active{
    background:rgb(50, 149, 159);
    color:white;
}