/core/client/templates/error.hbs

<section class="error-content error-404 js-error-container">
    <section class="error-details">
         <figure class="error-image">
             <img class="error-ghost" {{bind-attr src=ghostPaths.errorImageSrc srcset=ghostPaths.errorImageSrcSet}} />
         </figure>
         <section class="error-message">
             <h1 class="error-code">{{code}}</h1>
             <h2 class="error-description">{{message}}</h2>
             <a class="error-link" {{bind-attr href=ghostPaths.blogRoot}}>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">
            {{#foreach stack}}
                <li>
                    at
                    {{#if function}}<em class="error-stack-function">{{function}}</em>{{/if}}
                    <span class="error-stack-file">({{at}})</span>
                </li>
            {{/foreach}}
        </ul>
    </section>
{{/if}}