body { width: 1200px; }

.slick-initialized .slick-slide { max-width: 100%; max-height: 100%; }
/* ------------------------------------------------------------ mobile */
@media only screen and (max-width:640px){

body { width: 100%; max-width: 1200px; }

.slider { width: 100%; }
.slider li img { width: 100vw; height: auto; }

}