github-brighter-text.user.css

/* ==UserStyle==
@author       Wenfang Du
@homepageURL  https://github.com/wenfangdu/github-brighter-text
@license      MIT
@name         GitHub Brighter Text
@namespace    Wenfang Du
@preprocessor less
@updateURL    https://raw.githubusercontent.com/wenfangdu/github-brighter-text/main/github-brighter-text.user.css
@var          color text-color 'Text Color' #eee
@version      1.7.5
==/UserStyle== */

@document domain('github.com') {
  .mixin() {
    :root {
      --button-default-fgColor-rest: @text-color;
      --color-prettylights-syntax-comment: @text-color;
      --control-fgColor-placeholder: @text-color;
      --fgColor-muted: @text-color;
    }

    ::placeholder,
    .CommentBox-placeholder {
      opacity: 0.5;
    }
  }

  .mixin() !important;
}