How to add a bottom curve in a div - CSS?
<p>Following is my code in which I am unable to create a bottom curve but increasing the border-top-left-radius/border-top-right-radius is not able to create a bump as shown in fig. Let me know how can I handle this using CSS only.</p>

<p><strong>Code:</strong></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 {
  position: relative;
}
.rect {
  width: 334.5px;
  height: 223px;
  background: #34EFEE;
  text-align: center;
  line-height: 223px;
}
.rect:after {
  content: '';
  position: absolute;
  bottom: 0px;
  width: 334.5px;
  height: 15px;
  background: #FFFFFF;
  left: 0;
  border-top-left-radius: 50%;
  border-top-right-radius: 50%;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="container"&gt;
  &lt;div class="rect"&gt;
    &lt;h3&gt;334.5 X 223&lt;/h3&gt;
  &lt;/div&gt;
&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p>Expected Output -</p>

<p><a href="https://i.stack.imgur.com/LK8zj.png" rel="nofollow"><img src="https://i.stack.imgur.com/LK8zj.png" alt="Expected Output"></a></p>

<p><strong>PLNKR</strong> -- <a href="http://plnkr.co/edit/7oTCHyn8PFABri0KHSrH?p=preview" rel="nofollow">http://plnkr.co/edit/7oTCHyn8PFABri0KHSrH?p=preview</a></p>