.button_file {
    width: 120px;
    height: 120px;
    background: url(/img/button_file.png) center center / contain no-repeat;
    display: inline-block;
    cursor: pointer;
}
.button_file input{
    display: none;
}
#preview img{
     height: 120px;
     margin-right: 4px;
}