.firstpic,.firstpic img{
	
	position:fixed;
	inset:0;
	/*background-color:white;*/
	z-index:9999999;
	
	
	width:100%;
	height: 100%;
	
	display: block;
	
	
	
	animation:fadeOut 5s;
	animation-fill-mode:forwards;
	
	/*禁止响应鼠标事件*/
	pointer-events:none;
}

@keyframes fadeOut{
	/*定义动画关键帧*/
	0%{
                transform: scale(1);
        }
	50% {
		opacity:1;   /*	完全不透明*/
                transform: scale(1.05);
	}
	
	100% {
		opacity:0;  /*	完全透明*/
                visibility:hidden;   /*不占位置*/
                transform: scale(1.1);
	}
}