layouts/shortcodes/blocks/section-w-background.html

{{- $class := .Get "class" -}}
{{- $style := .Get "style" -}}
{{- $id := .Get "id" | default (printf "section-%d" .Ordinal) -}}
{{- $bg := .Get "background-image" -}}
{{- $image := $.Scratch.Get "bg" -}}
<section id="{{ $id }}"{{ with $class }} class="{{ . }}"{{ end }} style="background-image: url({{ $bg }}); {{ with $style }}{{ . | safeCSS }}{{ end }}">
	{{ $.Inner }}
</section>