```jsx
import React from 'react';

const DragonBoatFestivalPoster = () => {
  return (
    <div style={{ position: 'relative', width: '1080px', height: '1920px' }}>
      {/* 背景图层 */}
      <div style={{ position: 'absolute', top: 0, left: 0, width: '100%', height: '100%' }}></div>

      {/* 主体图层 */}
      <div style={{ position: 'absolute', top: '25%', left: '50%', transform: 'translate(-50%, -50%)', textAlign: 'center' }}>
        <h1></h1>
        <h2></h2>
      </div>

      {/* 活动亮点 */}
      <div style={{ position: 'absolute', bottom: '25%', left: '50%', transform: 'translateX(-50%)', width: '80%' }}>
        <div style={{ display: 'grid', gridTemplateColumns: 'repeat(3, 1fr)', gap: '20px' }}>
          <div style={{ textAlign: 'center' }}>
            <div></div>
            <h3></h3>
            <p></p>
          </div>
          <div style={{ textAlign: 'center' }}>
            <div></div>
            <h3></h3>
            <p></p>
          </div>
          <div style={{ textAlign: 'center' }}>
            <div></div>
            <h3></h3>
            <p></p>
          </div>
        </div>
      </div>

      {/* 页脚 */}
      <div style={{ position: 'absolute', bottom: '5%', left: '50%', transform: 'translateX(-50%)', textAlign: 'center' }}>
        <p></p>
        <div></div>
      </div>
    </div>
  );
};

export default DragonBoatFestivalPoster;
```