html::before { content: ""; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: conic-gradient( from 180deg at center, #003580 0deg, #0052a3 90deg, #0071e3 180deg, #0052a3 270deg, #003580 360deg ) fixed !important; /* sovrapponi un velo bianco semitrasparente al centro */ background-blend-mode: lighten; z-index: -1 !important; }