.banner { width: 1400px; max-width: 100%; overflow: visible;}
.banner img { width: 100%; height: 430px; object-fit: cover;}
.banner .swiper-slide::after { position: absolute; top: 0; left: 0; right: 0; z-index: 1; bottom: 0; content: ""; opacity: 1; background: rgba(255, 255, 255, .5); transition: all .3s; -ms-transition: all .3s;}
.banner .swiper-slide.swiper-slide-active::after { opacity: 0; z-index: -99;}