/* 设置页面背景图片和文字样式 */
body {
    margin: 0;
    padding: 0;
    height: 100vh;
    background-image: url('../img/123.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
  }
  
  /* 设置标题文字样式 */
  h1 {
    font-size: clamp(20px, 5vw, 50px);
    color: white;
    text-align: center;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.7);
    z-index: 2;
    position: relative;
  }
  
  /* 雪花样式 */
  .snowflake {
    position: absolute;
    top: -10px;
    color: white;
    font-size: 1em;
    opacity: 0.8;
    animation: fall linear infinite;
  }
  
  /* 定义雪花飘落的动画 */
  @keyframes fall {
    to {
      transform: translateY(100vh);
    }
  }