Ghost/core/client/app/templates/error.hbs

<section class="error-content error-404 js-error-container">
    <section class="error-details">
         <figure class="error-image">
             <img class="error-ghost" src="{{gh-path 'admin' '/img/404-ghost@2x.png'}}" srcset="{{gh-path 'admin' '/img/404-ghost.png'}} 1x, {{gh-path 'admin' '/img/404-ghost@2x.png'}} 2x" />
         </figure>
         <section class="error-message">
             <h1 class="error-code">{{code}}</h1>
             <h2 class="error-description">{{message}}</h2>
             <a class="error-link" href="{{gh-path 'blog'}}">Go to the front page →</a>
         </section>
    </section>
</section>

{{#if stack}}
    <section class="error-stack">
        <h3>Stack Trace</h3>
        <p><strong>{{message}}</strong></p>
        <ul class="error-stack-list">
            {{#each item in stack}}
                <li>
                    at
                    {{#if item.function}}<em class="error-stack-function">{{item.function}}</em>{{/if}}
                    <span class="error-stack-file">({{item.at}})</span>
                </li>
            {{/each}}
        </ul>
    </section>
{{/if}}