*{
    padding:0;
    margin:0;
 }
.img_div {
    /* margin: 20px 400px 0 400px; */
    position: relative;
    width: 15rem;
    height: 11.25rem;
	margin-left: 0;
}
.mask {
    position: absolute;
    top: 0;
    left: 0;
    width: 15rem;
    height: 10.3125rem;
    background: rgba(101, 101, 101, 0.6);
    color: #ffffff;
    opacity: 0;
}
.mask h3 {
    text-align: center;
}
.img_div a:hover .mask {
    opacity: 1;           
}
.wangankang {height: 60rem; max-width: 84.75rem; 
margin:auto; padding: 0 0 0 0px;
             position: relative; float: none;
			 
}
.picture{/* width: auto; */
	     
		 
}
.firstwang{max-width: 66.5rem;height: auto; float: left;text-align: -webkit-center;
	   
	   
}
.secondwang{max-width: 66.5rem;height: auto; float: left;text-align: -webkit-center;
	    
		
}
.firstlinean{max-width: 21.5rem;height: 31.25rem; float: left;margin-left: 1rem;
	   
	   
}
.secondlinean{max-width: 16.5rem;height: 31.25rem; float: left;
	    
		
}
.first1kang {display: block; width: auto;display: inline; float: left;
	     
		 
}
.first2kang{display: block; display: inline; float: left;
        
		
		
}
.second1kang{display: block; display: inline; float: left;
	     
		 
}
.second2kang{display: block; display: inline; float: left;
	     
		 
}