cupper-hugo-theme/layouts/shortcodes/colors.html

{{ $colorString := replace (.Get 0) " " "" | upper }}
{{ $colors := split $colorString "," }}
<div class="colors-container">
  <ul class="colors">
    {{ range $colors }}
      <li style="background-color: {{ . }};{{ if or (eq . "#FFFFFF") (eq . "#FFF")}} border: 1px solid #111{{ end }}">
        <span>{{ . }}</span>
      </li>
    {{ end }}
  </ul>
</div>