JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parentdiv">
    <iframe id="f1c27030c" name="f1f67bf5c4" scrolling="yes" style="border-top-style: solid; border-right-style: solid
; border-bottom-style: solid; border-left-style: solid; border-width: initial; border-color: initial; overflow-x: hidden; overflow-y: scroll !important; height: 300px; width: 630px; " class="fb_ltr" src="http://www.facebook.com/plugins/comments.php?channel_url=http%3A%2F%2Fstatic.ak.fbcdn.net%2Fconnect%2Fxd_proxy.php%3Fversion%3D2%23cb%3Df3ec50dad4%26origin%3Dfile%253A%252F%252Flocalhost%252Ff17ab9b71%26relation%3Dparent.parent%26transport%3Dpostmessage&amp;href=google.com&amp;locale=en_US&amp;numposts=12&amp;sdk=joey&amp;width=610"></iframe>
</div>

CSS

.parentdiv {
    overflow-y: scroll;
    height:500px !important;
}