#formulaire>a{
	position: absolute;
	top:0px;
	left: 0px;
    width: 100%;
    height: 100%;
    background-color: black;
    z-index: 0;
    opacity: .5;
}
#formulaire>div[class="cadre"]>a[title="Cerrar"]{
	position: absolute;
	top:10px;
	right: 10px;
    width: 50px;
    height: 50px;
    z-index: 0;
    text-align: center;
    font-size: 30px;
    line-height: 50px;
    text-decoration: none;
    color: black;

    transition-property: color;
    transition-duration: 0.8s;
    transition-timing-function:ease-in-out;
    transition-delay: 0s;
}

#formulaire>div[class="cadre"]>a[title="Cerrar"]:hover{color: tomato;}