title: Responsive circles in a row with flexbox
body: <p>I want to draw 4 circles, being all 4 flex-items, and I need them to scale with the container they are in. I have seen some solutions where <code>padding-bottom</code> is used, but I can´t really understand it.</p>
  
  <p>I managed to get the result that I want with specific <code>width</code> and <code>height</code> in the flex-items. Can anyone do the same but without that and keeping the same structure in my HTML?</p>
  
  <p><a href="https://jsfiddle.net/danaya/bq07omsq/" rel="nofollow noreferrer">This is the fiddle.</a></p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.container {
    display: flex;
    flex-wrap: nowrap;
    width: 200px;
    height: 50px;
  }
  .holder {
    margin-right: 5px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
  }
  .h1 {
    background: blue;
  }
  .h2 {
    background: red;
  }
  .h3 {
    background: green;
  }
  .h4 {
    background: grey;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="container"&gt;
    &lt;div class="holder h1"&gt;&lt;/div&gt;
    &lt;div class="holder h2"&gt;&lt;/div&gt;
    &lt;div class="holder h3"&gt;&lt;/div&gt;
    &lt;div class="holder h4"&gt;&lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>