javascript – 段落淡出底部

我正在尝试为段落添加淡出效果,这就是我所做的：

但是当我向下滚动时,褪色效果不会粘在div的底部：

我也在这个codepen中复制了这个问题：https://codepen.io/bij0520/pen/XoQpEW有没有办法让淡化效果始终坚持div的底部？谢谢.

.container{
  position:relative;
  width:300px;
  max-height:100px;
  overflow-y:scroll;
}
.container:after{
  content:"";
  position:absolute;
  z-index:1;
	bottom:0;
	pointer-events: none;
	background-image: linear-gradient(to bottom,rgba(255,255,0),1) 90%);
	width: 100%;
	height: 4rem;
}

<div class="container">
  <p>
   Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries,but also the leap into electronic typesetting,remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages,and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. 
  </p>
</div>

解决方法

一点点样式表改变了我.你想要p滚动,而不是容器.

.container{
      position:relative;
      width:300px;
      max-height:100px;  
    }
    .container p {
      overflow-y:scroll;
      max-height:100px;
    }
    .container:after{
      content:"";
      position:absolute;
      z-index:1;
    	bottom:0;
    	pointer-events: none;
    	background-image: linear-gradient(to bottom,1) 90%);
    	width: 100%;
    	height: 4rem;
    }

<div class="container">
  <p>
   Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. 
  </p>
</div>