.fileItemBox{
    position: relative;
    float: left;
    width: 100px;
    height: 100px;
}
.fileItemBox .float-div{
    width: 100px;
    height: 100px;
    position: absolute;
    left: 0px;
    top: 0px;
    display: none;
    text-align: right;
    background-color: #FFFFFF90;
    color: #000000;
    font-size: 20px;
}