:root { --max-screen-width: 1240px; }  @media (max-width: 1280px) { :root { --max-screen-width: 1100px; } }  @media (max-width: 992px) { :root { --max-screen-width: 860px; } }  @media (max-width: 768px) { :root { --max-screen-width: 680px; } }  @media (max-width: 480px) { :root { --max-screen-width: 420px; } }