{{ $class := .Get "class" }}
{{ with .Page.Resources.ByType "image" }}
<div class="flexbox box-size-third {{ $class }}">
    {{ range . }}
    <div class="flexitem">
        {{- $image := .Resize "100x" -}}
        <img src="{{ $image.RelPermalink }}">
    </div>
    {{ end }}
</div>
{{ end }}