.pro{
position: relative;
overflow: hidden;
}
.file{
position: absolute;
left:0;
top:0;
bottom: 0;
right: 0;
width: 100%;
height: 100%;
opacity: 0;
cursor: pointer;
font-size:100px;
filter: alpha(opacity=0);
}
.cnt{
position: absolute;
left:-999999px;
}