Black Background not Transparent

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I am using this block with the Greek Yogurt theme.
I cannot see any options to change the text background and can only get black with no transparency.
How do I change this?

Type: Pre-Sale
Status: New
dombrown
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# concrete5 Version
5.6.3.4

# concrete5 Packages
Image Caption (1.5.1).

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blocks/travisn_spacer, elements/jacks_image_caption.zip, elements/travisn_spacer.zip, elements/jacks_image_caption, elements/travisn_spacer, languages/sk_SK, languages/ro_RO, languages/fr_FR, languages/es_MX, languages/pt_BR, languages/pt_PT, languages/ar, languages/da_DK, languages/fa_IR, languages/fi_FI, languages/nb_NO, languages/de_DE, languages/pl_PL, languages/el_GR, languages/nl_NL, languages/es_ES, languages/it_IT, languages/sl_SI, languages/sv_SE, languages/tr_TR, languages/es_PE, languages/vi_VN, languages/ja_JP, languages/cs_CZ, languages/zh_TW, languages/ru_RU, languages/es_AR, themes/theme_karma

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