* {
    box-sizing: border-box;
  }
  body {
    display: flex;
    font-family: Arial, sans-serif;
    margin: 0;
  }
  #sidebar {
    width: 30%;
    background-color: #f4f4f9;
    padding: 20px;
    border-right: 1px solid #ddd;
    height:100vh;
  }
  #content {
    width: 70%;
    padding: 20px;
  }
  #createNotebookBtn, #overviewBtn, #dataBtn, #deleteNotebookBtn {
    display: inline-block;
    padding: 10px 20px;
    margin-bottom: 20px;
    background-color: #00bcff;
    color: white;
    border: none;
    cursor: pointer;
    margin-right: 10px;
    font-size:1em;
  }
  #notebooks {
    list-style: none;
    padding: 0;
  }
  .notebook-item {
    padding: 10px;
    border-bottom: 1px solid #ddd;
    cursor: pointer;
  }
  .notebook-item.active {
    background-color: #e4e4e4;
  }
  .notebook-item:hover,.overview-item:hover,.overview-title:hover {
    background-color: #e4e4e4;
  }
  #title {
    font-size: 24px;
    margin-bottom: 10px;
    width:100%;
  }
  #textArea {
    width: 100%;
    height: calc(100vh - 160px);
    border: 1px solid #ddd;
    padding: 10px;
    resize: none;
    white-space: pre-wrap;
    font-size: 1em;
    /*font-family: monospace;*/
  }
  .overview {
    padding: 10px;
  }
  .overview-notebook {
    margin-bottom: 20px;
  }
  .overview-title {
    font-size: 1em;
    font-weight: bold;
    margin-bottom: 10px;
  }
  .overview-item {
    padding-left: 20px;
    cursor: pointer;
  }
  .data-section {
    display: none;
    margin-top: 20px;
  }
  .data-section button {
    display: block;
    margin: 10px 0;
    padding: 10px;
    background-color: #00bcff;
    color: white;
    border: none;
    cursor: pointer;
    font-size:1em;
  }

  /* Style for the item being dragged */
.notebook-item.dragging {
  opacity: 0.5;
  background-color: #d0e8ff; /* Light blue for visibility */
}

/* Style for the drop target area */
.notebook-item.drop-target {
  border-top: 2px dashed #00bcff;
  background-color: #f0faff;
}