.testsite{position:fixed;top:0;left:0;right:0;bottom:0;border:8px ridge #c80000;pointer-events:none;opacity:.7;z-index:999}.testsite:before{content:"⚠ This is a test system.";font-size:12px;background:#c80000;color:#fff;position:fixed;top:0;left:0;padding:2px 4px;font-weight:700}