cartodb/public/404.html

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    <title>CartoDB - 404 Error</title>
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  <body class="front error">
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      <div class="content">
        <h2 class="center">What a pity, the page you are looking for doesn’t exist</h2>
        <img src="/assets/layout/unknown.png" alt="404" title="404" class="alone" />
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        <p class="center lighter"><a href="/dashboard">Back to your dashboard</a></p>
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      <h1><a href="/" class="cartodb">CartoDB</a></h1>
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