Semantic UI Sample
HTML
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.css">
<script src="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.js"></script>
<div class="ui raised very padded text container segment">
<div class="ui labeled input">
<div class="ui label">http://</div>
<input type="text" placeholder="medium.com">
</div>
</div>