The syntax highlighting done by the Code Macro lacks contrast

WCAG warnings in the test class [org.xwiki.export.pdf.test.ui.AllIT]:
__________
Validation in the test method [codeMacro]
Check for [org.xwiki.test.ui.po.ViewPage] at [http://xwikiweb:8080/xwiki/bin/view/PDFExportIT/CodeMacro].
Found [2] items1: Elements must meet minimum color contrast ratio thresholds
Description: Ensures the contrast between foreground and background colors meets WCAG 2 AA minimum contrast ratio thresholds
Help URL: https://dequeuniversity.com/rules/axe/4.7/color-contrast?application=axeAPI
Help: Elements must meet minimum color contrast ratio thresholds
Impact: serious
Tags: cat.color, wcag2aa, wcag143, ACT, TTv5, TT13.cHTML element: 
    <span style="font-style: italic; color: #408080; ">
Selector: [#xwikicontent > .box > .code > span:nth-child(1)]
Fix any of the following:
  Element has insufficient color contrast of 4.17 (foreground color: #408080, background color: #f5f5f5, font size: 10.5pt (14px), font weight: normal). Expected contrast ratio of 4.5:1HTML element: 
    <span style="font-style: italic; color: #408080; ">/**<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;* Maps local IDs to global IDs.<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*/</span>
Selector: [span:nth-child(41)]
Fix any of the following:
  Element has insufficient color contrast of 4.17 (foreground color: #408080, background color: #f5f5f5, font size: 10.5pt (14px), font weight: normal). Expected contrast ratio of 4.5:1HTML element: 
    <span style="color: #AA22FF; ">@Override</span>
Selector: [span:nth-child(52)]
Fix any of the following:
  Element has insufficient color contrast of 4.39 (foreground color: #aa22ff, background color: #f5f5f5, font size: 10.5pt (14px), font weight: normal). Expected contrast ratio of 4.5:1

[...]