redstrate.com/themes/red/layouts/404.html

{{ define "main" }}
    <p style="float: left">Page not found!</p>

    {{ with resources.Get "404.webp" }}
    {{ $alt_text := "Sakura is confused about where the page went, or maybe where you shouldn't go." }}
    <img title="{{ $alt_text }}" alt="{{ $alt_text }}" style="width: 40%; height: auto; float: right" width="{{ .Width }}" height="{{ .Height }}" src="{{ .RelPermalink }}"/>
    {{ end }}
{{ end }}