.file {
    position: relative;
    display: inline-block;
    padding: 2px 0px;
    overflow: hidden;
    color: #77bd66;
    text-decoration: none;
    text-indent: 0;
    line-height: 20px;
}
.file input {
    position: absolute;
    font-size: 100px;
    right: 0;
    top: 0;
    opacity: 0;
    z-index: 999;
}
.file>i{
    width: 18px;
    position: relative;
    top: 5px;
}
.file>b{
    width: 270px;
    position: relative;
    top: 3px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}