body {
  margin: 0;
  padding: 40px;
  font-family: Inter, sans-serif;
  /* SVG data‑URI for a single smooth gradient */
  background-image: url("data:image/svg+xml;charset=UTF-8,\
<svg xmlns='http://www.w3.org/2000/svg' preserveAspectRatio='none' viewBox='0 0 1 1'>\
<linearGradient id='g' x1='0' y1='0' x2='0' y2='1'>\
<stop offset='0%' stop-color='%23000000'/>\
<stop offset='100%' stop-color='%23d3d3d3'/>\
</linearGradient>\
<rect width='1' height='1' fill='url(%23g)'/></svg>");
  background-repeat: no-repeat;
  background-size: 100% 100%;
  color: #ffffff;
  text-align: center;
  box-sizing: border-box;
  min-height: 100vh;
}