The current implementation is based on a customized version of Bootstrap v4 alpha.
The following stylesheets have to be imported to the page:
<link rel="stylesheet" type="text/css" href="https://msd.lewa.com/typo3conf/ext/lewa/Resources/Public/CSS/style.css">
<link rel="stylesheet" type="text/css" href="https://msd.lewa.com/typo3conf/ext/lewa/Resources/Public/CSS/override.css">
<link rel="stylesheet" type="text/css" href="https://msd.lewa.com/typo3conf/ext/lewa/Resources/Public/CSS/override_msd.css">