css - 如何能够在 flexbox (CSS) 内滚动覆盖 div？

Question

我有一个带有 2 个导航栏的应用程序布局，一个内容包含 3 个主要部分，一个左面板、一个主面板和一个右面板。我为面板找到的最简单方法是使用 flex 盒。但是，在左侧面板中，我有一个阶梯式工作流，其中有一个叠加在进度条顶部的步骤。问题是，如果您将浏览器设置得太小，就会出现溢出，出现滚动条，但进度条不会滚动。请帮忙!

这是 jsfiddle... https://jsfiddle.net/dpkxzgv9/1/

HTML:

    <div class='ngcds-container'>
    <div class='ngcds-navbar'>Primary navigation bar</div>

  <div class='ngcds-secondary-navbar'>Secondary navigation bar</div>

    <div class='ngcds-body ngcds-body-top'>
        <div class='ngcds-content'>
      <div class='ngcds-left-panel workflow-side-panel'>
        <div id='divWorkflowBar' class='workflow-bar'>
          <div id='divWorkflowBarProgress' class='workflow-bar-progress' style='height: 50%'>
          </div>
        </div>

        <div id='workflow-items' class='workflow-items'>
          <div class='workflow-item'>
            <div id='divWorkflowCircle' class='workflow-circle done'>
              <div id='divWorkflowInnerCircle' class='workflow-inner-circle done'></div>
            </div>
            <div id='divWorkflowText' class='workflow-text done'>Step 1</div>
          </div>
          <br>
          <div class='workflow-item'>
            <div id='divWorkflowCircle' class='workflow-circle done'>
              <div id='divWorkflowInnerCircle' class='workflow-inner-circle done'></div>
            </div>
            <div id='divWorkflowText' class='workflow-text done'>Step 2</div>
          </div>
          <br>
          <div class='workflow-item'>
            <div id='divWorkflowCircle' class='workflow-circle done'>
              <div id='divWorkflowInnerCircle' class='workflow-inner-circle done'></div>
            </div>
            <div id='divWorkflowText' class='workflow-text done'>Step 3</div>
          </div>
          <br>
          <div class='workflow-item selected'>
            <div id='divWorkflowCircle' class='workflow-circle selected'>
              <div id='divWorkflowInnerCircle' class='workflow-inner-circle selected'></div>
            </div>
            <div id='divWorkflowText' class='workflow-text selected'>Step 4</div>
          </div>
          <br>
          <div class='workflow-item'>
            <div id='divWorkflowCircle' class='workflow-circle'>
              <div id='divWorkflowInnerCircle' class='workflow-inner-circle'></div>
            </div>
            <div id='divWorkflowText' class='workflow-text'>Step 5</div>
          </div>
          <br>
          <div class='workflow-item'>
            <div id='divWorkflowCircle' class='workflow-circle'>
              <div id='divWorkflowInnerCircle' class='workflow-inner-circle'></div>
            </div>
            <div id='divWorkflowText' class='workflow-text'>Step 6</div>
          </div>
          <br>
          <div class='workflow-item'>
            <div id='divWorkflowCircle' class='workflow-circle'>
              <div id='divWorkflowInnerCircle' class='workflow-inner-circle'></div>
            </div>
            <div id='divWorkflowText' class='workflow-text'>Step 7</div>
          </div>
        </div>
      </div>

      <div class='ngcds-main-panel'>
        main panel
      </div>

      <div class='ngcds-right-panel'>
        right side panel
      </div> 
    </div>
    </div>
</div>

CSS:

html,
body {
    min-height: 100%;
    min-width: 600px;
}

.ngcds-container {
    height: 100%;
    width: 100%;
}

.ngcds-body {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  position: absolute;
  right: 0;
  left: 0;
    bottom: 0;
}

.ngcds-body-top {
    top: 110px;
}

.ngcds-navbar {
    background-color: #276193;
    color: white;
    height: 40px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
  padding: 5px;
  box-sizing: border-box;
    z-index: 2;
}

.ngcds-secondary-navbar {
    background-color: #068CC1;
    color: white;
    height: 70px;
    position: fixed;
    top: 40px;
    left: 0;
    right: 0;
  padding: 5px;
  box-sizing: border-box;
    z-index: 1;
}

.ngcds-content {
  display: flex;
    flex: auto;
}

.ngcds-left-panel {
  order: 1;
  background: #3E4B52;
  color: white;
  flex: 0 0 auto;
}

.ngcds-main-panel {
  padding: 10px;
  flex: 1;
  order: 2;
  font-size: 24px;
  overflow: auto;
}

.ngcds-right-panel {
  padding: 5px;
  background: #3E4B52;
  color: white;
  order: 3;
  flex: 0 0 auto;
}

.workflow-side-panel {
  overflow-y: auto;
  box-sizing: border-box;
}

.workflow-bar
{
  position: absolute;
  top: 63px;
    background: #4D595F;
    height: calc(100% - 126px);
    width: 20px;
    margin: 10px 0px 0px 5px;
    margin: 0px 0px 0px 31px;
  z-index: 0;
}

.workflow-bar-progress
{
  position: relative;
    background: #068CC1;
    width: #068CC1;
}

.workflow-items {
  padding: 0;
  height: 100%;
  list-style: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.workflow-item {
    width: 100%;
  height: 66px;
    cursor: pointer;
  border-right: 10px solid #3E4B52;
  box-sizing: border-box;
  z-index: 2;
}

.workflow-item.selected {
    border-right: 10px solid #068CC1;
}

.workflow-item:first-child {
    margin-top: 31px;
}

.workflow-item:last-child {
    margin-bottom: 31px;
}

.workflow-circle {
    float: left;
  width: 40px;
  height: 40px;
  margin-top: 12px;
  margin-left: 20px;
  background: #4D595F;
  border: 1px solid #666666;
  -moz-border-radius: 50px;
  -webkit-border-radius: 50px;
  border-radius: 50px;
}

.workflow-circle.done
{
    background: #068CC1;
    border: 1px solid #6B9EB6;
}

.workflow-circle.selected
{
    background: #068CC1;
    border: 1px solid #9ADDF7;
  opacity: 1.00;
}

.workflow-inner-circle {
  width: 18px;
  height: 18px;
  margin: 11px 0px 0px 11px;
  background-color: #697277;
  -moz-border-radius: 50px;
  -webkit-border-radius: 50px;
  border-radius: 50px;
}

.workflow-inner-circle.done {
  background-color: #9ADDF7;
  opacity: 0.70;
}

.workflow-inner-circle.selected {
  background-color: #9ADDF7;
  opacity: 1.00;
}

.workflow-text {
  float: left;
  height: 66px;
  margin-left: 15px;
  margin-right: 10px;
  line-height: 66px;
  text-align: center;
  font-size: 18px;
  font-weight: normal;
  opacity: 0.80;
}

.workflow-text.done {
  font-weight: normal;
  opacity: 1.00;
}

.workflow-text.selected {
  font-weight: 600;
  opacity: 1.00;
}

Answer 1

将 position: relative; 添加到 ngcds-left-panel workflow-side-panel div。它应该按预期工作。

已更新 fiddle