html - 将滚动条添加到嵌套容器

Question

我试图让容器 (.widget2) 在容器 (.content) 中滚动并仍然保持边界。

由于某种原因，内部容器滚动超过父容器的底部边缘，并且滚动条不呈现。

这是一个 fiddle 来展示我在说什么: https://jsfiddle.net/ggongon/kcyxz34L/1/

*,
*:before,
*:after {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}
html,
body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}
#container {
  border: 6px solid red;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  /* position:absolute;
 top:10px; left:10px; right:10px; bottom:10px; */
}
#summary {
  height: 60px;
  border: 2px solid green;
}
#content {
  padding: 10px;
  border: 2px solid blue;
  overflow: hidden;
}
.widget {
  background: gray;
  border-radius: 12px;
  min-height: 30px;
}
.widget2 {
  overflow: auto;
}
.padbottom {
  margin-bottom: 20px;
}

<div id="container">
  <div id="summary">
    header section
  </div>
  <div id="content">
    <div class="widget padbottom">
      widget area
    </div>
    <div class="widget widget2">
      another widget area <br /><br>
      Problem:<br>
      1. this widget area scrolls past the bottom red border<br >
      2. How do i add a scroll in this section only and maintain the 10px padding within the content area <br><br><br>
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    </div>
     </div>
</div>

Answer 1

要使 .widget2 可滚动，只需将父容器设为 flex 容器即可。

#content {
  padding:10px;
  border:2px solid blue;
  overflow:hidden;
  display: flex;          /* NEW */
  flex-direction: column; /* NEW */
}

revised fiddle