flex box layout combine three elements in one column
<p>my issue is in image: <a href="https://i.stack.imgur.com/BhADi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BhADi.png" alt="issue"></a></p>

<p>a need to arrange three small elements in one column besides big one.</p>

<p>sample html:</p>

<pre><code>&lt;div class="container"&gt;
    &lt;div class="big_element"&gt;&lt;/div&gt;
    &lt;div class="small_element"&gt;&lt;/div&gt;
    &lt;div class="small_element"&gt;&lt;/div&gt;
    &lt;div class="small_element"&gt;&lt;/div&gt;
&lt;/div&gt;
</code></pre>

<p>and the CSS:</p>

<pre><code>.container {
    display: flex;
    flex-direction: row; width: 496px;
}
.big_element, .small_element {
    display: flex;
    width: 248px;
}
</code></pre>