404.hbs

<style>
  * {
    line-height: 1.2;
    margin: 0;
  }

  html {
    color: #888;
    display: table;
    font-family: sans-serif;
    height: 100%;
    text-align: center;
    width: 100%;
  }

  body {
    display: table-cell;
    vertical-align: middle;
    margin: 2em auto;
  }

  .logo {
    vertical-align: top;
    margin-top: 8px;
    width: 32px;
    height: 32px;
  }

  h1 {
    color: #999;
    font-size: 2em;
    font-weight: 400;
  }

  p {
    margin: 0 auto;
    width: 280px;
  }

  @media only screen and (max-width: 280px) {
    body, p {
        width: 95%;
    }
    h1 {
        font-size: 1.5em;
        margin: 0 0 0.3em;
    }
  }
</style>
<img class="logo" src="https://hub.jazz.net/api/v1/composition/graphics/header/bluemix-logo.png" />
<h1>{{message}}</h1>
<p>Sorry, but the page you were trying to view does not exist.</p>