bootstrap 4 metro style code example
Example: metro ui
<link rel="stylesheet" href="https://cdn.metroui.org.ua/v4.3.2/css/metro-all.min.css">
<script src="https://cdn.metroui.org.ua/v4.3.2/js/metro.min.js"></script>
<link rel="stylesheet" href="https://cdn.metroui.org.ua/v4.3.2/css/metro-all.min.css">
<script src="https://cdn.metroui.org.ua/v4.3.2/js/metro.min.js"></script>