It is easy to put a border around this <i>flag</i> image
Stadt <a href="//commons.wikimedia.org/wiki/B%C3%BCnde" title="Bünde">Bünde</a>
1972-04-28
based upon <a href="//commons.wikimedia.org/wiki/File:Banner_der_Stadt_B%C3%BCnde.png" class="image"><img alt="Banner der Stadt Bünde.png" src="https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Banner_der_Stadt_B%C3%BCnde.png/30px-Banner_der_Stadt_B%C3%BCnde.png" decoding="async" width="30" height="70" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Banner_der_Stadt_B%C3%BCnde.png/45px-Banner_der_Stadt_B%C3%BCnde.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Banner_der_Stadt_B%C3%BCnde.png/60px-Banner_der_Stadt_B%C3%BCnde.png 2x" data-file-width="1002" data-file-height="2338"></a>, file made by TUBS