* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
  }
  
  .demo {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-color: #fff;
  }
  
  .demo-tip {
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    width: 240px;
    height: 60px;
    padding: 4px;
    color: #fff;
    cursor: pointer;
    visibility: hidden;
    background-color: rgba(0, 0, 0, 0.5);
    border-radius: 4px;
  }
  
  .demo-tip-title {
    font-weight: bold;
  }
  
  .demo-container {
    width: 100%;
    height: 100%;

  }
  
  .demo-bottom-bar {
    display: flex;
    align-items: center;
    width: 100%;
    height: 100px;
    text-align: center;
    justify-content: center;
  }
  
  .demo-bottom-card {
    width: 140px;
    height: 70px;
    margin-left: 1rem;
    cursor: pointer;
    background-repeat: no-repeat;
    background-size: cover;
    border-radius: 4px;
  }