body {
    font-family: Arial, sans-serif;
    overflow: hidden;
    margin: 0;
    padding: 0;
  }
  
  #menu {
    position: relative;
    display: inline-block;
  }
  
  #addPaneButton {
    margin: 10px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
  }
  
  #submenu {
    display: none;
    position: absolute;
    top: 40px;
    left: 0;
    background-color: white;
    box-shadow: 0px 8px 16px rgba(0, 0, 0, 0.2);
    z-index: 1;
  }
  
  #submenu button {
    padding: 10px 20px;
    width: 100%;
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
  }
  
  #submenu button:hover {
    background-color: #f1f1f1;
  }
  
  #paneContainer {
    position: relative;
    width: 100%;
    height: calc(100vh - 50px);
    background-color: #f0f0f0;
    overflow: hidden;
  }
  
  #taskbar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50px;
    background-color: #007bff;
    display: flex;
    align-items: center;
    padding: 0 10px;
    box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.2);
  }
  
  .taskbar-button {
    background: none;
    border: none;
    color: white;
    padding: 5px 10px;
    cursor: pointer;
    margin: 0 5px;
    font-size: 14px;
    border-radius: 3px;
    transition: background-color 0.3s;
  }
  
  .taskbar-button:hover {
    background-color: rgba(255, 255, 255, 0.2);
  }
  
  .pane {
    position: absolute;
    width: 300px;
    height: 200px;
    background-color: white;
    border: 1px solid #ccc;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    z-index: 1;
  }
  
  .pane-header {
    background-color: #007bff;
    color: white;
    padding: 5px;
    cursor: move;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .pane-content {
    padding: 10px;
    flex-grow: 1;
    overflow: auto;
  }
  
  .browser-pane .pane-content {
    padding: 0;
    display: flex;
    flex-direction: column;
  }
  
  .browser-pane .url-bar {
    padding: 5px;
    border-bottom: 1px solid #ccc;
    display: flex;
  }
  
  .browser-pane .url-bar input {
    flex-grow: 1;
    padding: 5px;
  }
  
  .browser-pane .url-bar button {
    padding: 5px 10px;
  }
  
  .browser-pane iframe {
    flex-grow: 1;
    border: none;
  }
  
  .close-button, .minimize-button, .maximize-button {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    margin-left: 5px;
  }