.swiper-slide .a{display: block;height: 100vh;min-height: 500px;}
.swiper-slide .a{position: relative;display: block;overflow: hidden;}
.swiper-slide .bg video{ width: 100%; height: 100%; object-fit: cover;}



.swiper-slide .bg{-webkit-transform: scale(1.1);position: absolute;top: 0;left: 0;right: 0;bottom: 0;z-index: 0;transition:linear 5s;background-size: cover !important;}
.swiper-slide-active .bg{-webkit-transform: scale(1);}