美化 input type=file控件

<a href="javascript:;" class="go_upload">上传游戏安装包
                        <input class="upload_input" type="file" value="上传游戏安装包"/>
                    </a>

.go_upload{
    position: relative;
    display: inline-block;
    background: #3ca4fd;
    padding: 13px 103px;
    overflow: hidden;
    color: #ffffff;
    text-decoration: none;
    text-indent: 0;
    line-height: 20px;
}
.upload_input{
    position: absolute;
    font-size: 100px;
    right: 0;
    top: 0;
    opacity: 0;
}