{{ $size := .Get 0 }}
{{ if not (or (eq $size "full") (eq $size "half") (eq $size "quarter")) }}
    {{ errorf "Enlarge shortcode size parameter must be one of: full, half, quarter. Got: %s" $size }}
{{ end }}

<div class="enlarge-{{ $size }}">
{{ .Inner | safeHTML }}
</div>