Border circle looks blurry
<p>This circle with border looks blurry. Is it possible to fix it and how?</p>

<p><div class="snippet" data-lang="js" data-hide="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>div {
  border-radius: 50%;
  border: 1px solid black;
  height: 22px;
  width: 22px;
  background-color: white;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div&gt;&lt;/div&gt;</code></pre>
</div>
</div>
</p>