.file {
    display: inline-block;
    overflow: hidden;
    position: relative;
    vertical-align: middle;
 	width: 50px;
 	margin-top: -9px;
 	height: 22.5px;
 	text-align: center;
 	font-family: "宋体";
	font-size: 12px;
	font-weight: 400;
	font-style: normal;
	color: #000;
}
.file input.hifile {
    cursor: pointer;
    font-size: 12px;
    opacity: 0;
    filter:alpha(opacity=0);
    position: absolute;
    right: -1px;
    top: 0;
}