Edit autosave frequency contrast issue

WCAG warnings in the test class [org.xwiki.administration.test.ui.AllITs]:
__________
Validation in the test method [createPagesFromTemplate]
Check for [org.xwiki.test.ui.po.editor.EditPage] at http://xwikiweb:8080/xwiki/bin/edit/NestedPageTemplatesIT/createPagesFromTemplate/TestTemplateInstance/WebHome?template=NestedPageTemplatesIT.createPagesFromTemplate.TestTemplate&parent=NestedPageTemplatesIT.createPagesFromTemplate.TestTemplateProvider&title=TestTemplateInstance&form_token=VJJEvajnPexyqoSxcoXyQQ.

1: Elements must have sufficient color contrast
Description: Ensures the contrast between foreground and background colors meets WCAG 2 AA contrast ratio thresholds
Help URL: https://dequeuniversity.com/rules/axe/4.6/color-contrast?application=axeAPI
Help: Elements must have sufficient color contrast
Impact: serious
Tags: cat.color, wcag2aa, wcag143, ACT

HTML element: 
    <label class="frequency" style="opacity: 0.2;">every <input type="text" value="5" size="2" class="autosave-frequency"> <span>minutes</span></label>
Selector: [.frequency]
Fix any of the following:
  Element has insufficient color contrast of 1.43 (foreground color: #cdcdcd, background color: #f3f3f3, font size: 10.5pt (14px), font weight: normal). Expected contrast ratio of 4.5:1

HTML element: 
    <input type="text" value="5" size="2" class="autosave-frequency">
Selector: [.autosave-frequency]
Fix any of the following:
  Element has insufficient color contrast of 1.35 (foreground color: #dddddd, background color: #ffffff, font size: 10.5pt (14px), font weight: normal). Expected contrast ratio of 4.5:1

HTML element: 
    <span>minutes</span>
Selector: [.frequency > span]
Fix any of the following:
  Element has insufficient color contrast of 1.43 (foreground color: #cdcdcd, background color: #f3f3f3, font size: 10.5pt (14px), font weight: normal). Expected contrast ratio of 4.5:1

Very light grey on a white background, probably because of low opacity.