Background dégradé

.gradient {

     background: -webkit-radial-gradient(center center, rgb(RR, GG, BB) 0%, rgb(RR, GG, BB) 100%);

     background: -moz-radial-gradient(center center, rgb(RR, GG, BB) 0%, rgb(RR, GG, BB) 100%);

     background: -ms-radial-gradient(center center, rgb(RR, GG, BB) 0%, rgb(RR, GG, BB) 100%);

     background: -o-radial-gradient(center center, rgb(RR, GG, BB) 0%, rgb(RR, GG, BB) 100%);

     background: radial-gradient(center center, rgb(RR, GG, BB) 0%, rgb(RR, GG, BB) 100%);

}