Hello Martin,

I've added some CSS to your template's custom.css file to address this. Here's the code:

body.view-article .article-details div[itemprop="articleBody"],
body.view-article .article-details .custom-article-content,
body.view-article .pagenavigation,
body.view-article .related-article-list-container {
    max-width: unset !important;
}

Hope this helps!

Best regards