<body>
<section id="successMessage">
<div class="popup">
<h2>Успешно!</h2>
</div>
</section>
<script type="text/javascript" charset="utf-8">
setTimeout(() => successMessage.hidden = true, 2000)
</script>
</body>.post-preview_main__date {
display: inline-block;
float: left;
line-height: calc(5em/3);
}
span.post-preview_main__date__value {
vertical-align: top;
}