video { 
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
	z-index: -1;
    object-fit: cover;
    object-position: center;
	/*-webkit-filter: grayscale(20%);灰度蒙版*/
	background: url("/img/bcp-1-bg.jpg") no-repeat;
	background-size: cover;
	display: block; 
}
/* 暗色滤镜层 */
.dark-overlay {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: rgba(0,0,0,0.20); 
	z-index: 1;
}
header {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: -1;
	text-align: center;
	color: white;
	transition: .4s;
}
header:hover {
	background: rgba(255,255,255,0.8);
	color: #000;
}
div#fashion {
	min-height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
}