:root { --bg:#eef4f6; }
body {
  background:
    radial-gradient(circle at 12% -10%,rgba(132,181,202,.12),transparent 30rem),
    radial-gradient(circle at 95% 15%,rgba(151,199,211,.09),transparent 28rem),
    var(--bg);
}
header { background:rgba(238,244,246,.86); }
footer { background:rgba(255,255,255,.34); }