CSS background 渐变背景示例

<!DOCTYPE html>
<html>
  <head>
    <style>
      .gradient-box {
        width: 100%;
        height: 300px;
        border: 1px solid #aaa;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.2rem;
        color: #222;
        margin-bottom: 5px;
      }
      .linear-gradient-bg {
        background: linear-gradient(135deg, #ff6b6b 0%, #4ecdc4 100%);
      }
      .radial-gradient-bg {
        background: radial-gradient(circle at 50% 50%, #ffde70 0%, #f26d6d 100%);
      }
      .radial-gradient-bg-2 {
        background-image: radial-gradient(circle at 1px 1px, rgba(0, 0, 0, 0.15) 1px, transparent 0);
        background-size: 20px 20px;
      }