body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f0f0f0;
  }
  #viewer-wrapper {
    position: relative;
    height: 100vh;
    margin: 0;
    background: #fff;
  }
  #viewer {
    width: 100%;
    height: 100%;
  }
  #controls {
    text-align: center;
    margin-top: 10px;
  }
  button {
    margin: 0 10px;
    padding: 10px 20px;
    font-size: 16px;
  }
  #area {
    width: 100%;
  height: 100vh;
  }
  

  #nav-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    z-index: 10;
  }
  
  #left-zone, #right-zone {
    flex: 1;
    height: 100%;
  }
  
  #left-zone {
    /* קדימה */
  }
  
  #right-zone {
    /* אחורה */
  }