CSS 带定位的 Flexbox 居中项目

CSS Flexbox Center Items with Positioning

我正在尝试使用 flexbox 将 3 个元素放置在特定位置,同时水平和垂直居中。

像这样:

这就是我到目前为止的情况,我在这里做错了什么?

.container {
  width: 100%;
  max-width: 800px;
  height: auto;
  margin: 0 auto;
  background: pink;
  display: flex;
  flex-wrap: wrap;
  flex-direction: column;

  .first  { 
    background: green; 
    height: 50px;
    align-self: stretch;
  }

  .second { 
    background: blue; 
    height: 100px;
  }

  .third  { 
    background: crimson; 
    height: 100px;
  }
}
<div class="container">
  <div class="first"></div>
  <div class="second"></div>
  <div class="third"></div>
</div>

    

看看这个 fiddle:https://jsfiddle.net/u21uqs7q/

只需使用以下代码片段更新您的代码..

.container {
 width: 100%;
 max-width: 800px;
 height: 100vh;
 margin: 0 auto;
 background: pink;
 display: flex;
  align-items: center;
  justify-content: center;
 
}
 .left  .first { 
  background: green; 
  height: 50px;
 }
 
 .right .second { 
  background: blue; 
  height: 100px;
 }
 
 .right .third  { 
  background: crimson; 
  height: 100px;
 }
<div class="container">
 <div class="left">
  <div class="first">111</div>
  </div>
  
 <div class="right">
  <div class="second">222</div>
 <div class="third">333</div>
  </div> 
</div>