css3 怎么实现像书籍装订线的效果

.test{
    width: 150px;
    height: 150px;
    margin: 20% auto;
    background-color: white;
    background-image: repeating-linear-gradient(to right, #aaa 5%, #eee 10%, #ccc 15%);
    box-shadow: 5px 5px 2px #eee;
      border-radius: 5px;
}