/*
    ColdProxy order form: the marker stylesheet.

    standard_cart's common.tpl links the active order form's css/custom.css, so its URL shows that a
    cart page came through this order form (docs/parity-checks.md, "Cart sessions"). WHMCS links it
    with its own version hash, not the file's, and Cloudflare caches it, so it holds no rule.
*/