CSS 生成コンテンツ

<div></div>

body,
div {
  background-repeat: no-repeat;
}
body {
  background-image: linear-gradient(#3a67ab, #e8f6ff 100%);
}
div {
  position: relative;
  width: 400px;
  height: 400px;
  background-image:
    linear-gradient(
      115deg,
      transparent 48%,
      brown,
      #996600,
      brown,
      transparent 52%
    ),
    linear-gradient(
      60deg,
      transparent 48%,
      brown,
      #996600,
      brown,
      transparent 52%
    ),
    radial-gradient(
      circle 10px at 50% 50%,
      #333333 30%,
      #999999 50%,
      transparent 50%
    ),
    radial-gradient(
      circle 10px at 50% 50%,
      #333333 30%,
      #999999 50%,
      transparent 50%
    ),
    radial-gradient(circle at 50% 50%, white 30%, #eeeeee 50%, transparent 50%),
    radial-gradient(circle at 50% 50%, white 30%, #eeeeee 50%, transparent 50%),
    radial-gradient(circle at 50% 50%, white 30%, #eeeeee 50%, transparent 50%);
  background-size:
    100px 100px,
    100px 100px,
    15px 15px,
    15px 15px,
    200px 200px,
    300px 300px,
    400px 400px;
  background-position:
    95% 120px,
    5% 120px,
    46% 80px,
    54% 80px,
    50% 0,
    50% 90px,
    50% 220px;
}
div::after {
  content: "";
  border: transparent solid 4px;
  border-left: orange 30px solid;
  height: 1px;
  width: 1px;
  position: absolute;
  left: 50%;
  top: 100px;
}

div::before {
  content: "Only one <div>";
  font-size: min(6vh, 2rem);
  justify-content: center;
  display: flex;
  font-family: comic-sans, papyrus, sans-serif;
}