title: border-width in em - but set a minimum border-width
body: <p>I want a div to have a border-width relative to the font-size, so I set for example <code>border-width: 0.1em;</code>. But if the font size is too small, no border appears as it is rendered smaller as <code>0.5px</code>. This is of course not what I want. Is there any chance to set a minimum border-width of <code>1px</code>?</p>
  
  <pre><code>div {
      border: 0.1em solid black;
  }
  </code></pre>