Custom Elements are losing borders [bug]

[dapi]

Use any kind of custom elements are losing its borders (ever use shadow DOM for styling) when links tacit.css

For example, add <link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/yegor256/tacit@gh-pages/tacit-css.min.css" /> to this sample - https://javascript.info/shadow-dom-style

[0crat]

@filfreire/z please, pay attention to this issue