natter/default_environment/stylesheet/language_nix.css

:root {
  --srclg-nix-srchl-keyword-color: #1a936f;
  --srclg-nix-srchl-comment-color: #048a81;
}

@media (prefers-color-scheme: light) {
  :root {
    --srclg-nix-srchl-keyword-color: green;
    --srclg-nix-srchl-comment-color: #bfbccb;
  }
}

.main_content {
  .src_block {
    &.srclg_nix {
      .srchl_keyword {
        color: var(--srclg-nix-srchl-keyword-color);
      }
      .srchl_comment {
        color: var(--srclg-nix-srchl-comment-color);
      }
    }
  }
}