The better coding would be:

<a class="twitter-timeline" href="https://twitter.com/KingtonKLEEN?ref_src=twsrc%5Etfw" data-width="100%" data-height="100%" data-chrome="transparent">Tweets by KingtonKLEEN</a>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>

and then adjust the Placeholder dimensions to suit.

Acorn