.box_tan{
        width: 100%;
        height: 100%;
        position: fixed;
        top: 0;
        left: 0;
        background: #000;
        opacity: 0.75;
    }
    .box_img{
        width: 100%;
        position: fixed;
        top: 5%;
        left: 0;
        text-align: center;
    }
    .box_img img{
        width: 60%;
        height: auto;

    }


.dingyue_bu{
	padding: 5px 10px;
	color: #5DBCD2;
	border: 1px solid #5DBCD2;
	display: inline-block;
	margin-left: 20px
}