<!DOCTYPE html>
<html>
  <head>
    <title>Czech Repucblic | Flags</title>
    <style>
      #czechrepublic {
        height: 0;
        width: 150px;
        border-top: solid 100px #fff;
        border-bottom: solid 100px #d7141a;
        border-left: solid 150px #11457e;
      }
    </style>
  </head>
  <body>
    <div id="czechrepublic"></div>
  </body>
</html>