body {
    width: 240px;
    padding: 15px;
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .header {
    margin-bottom: 10px;
    width: 100%;
    border-bottom: 1px solid #ccc;
    padding-bottom: 10px;
  }
  
  .header h1 {
    font-size: 16px;
    font-weight: bold;
    text-align: center;
    margin: 0;
  }
  
  .buttons-row {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-bottom: 10px;
    align-items: flex-start;
  }
  
  button {
    padding: 8px 12px;
    font-size: 14px;
    cursor: pointer;
    background-color: #1ABC9C;
    color: white;
    border: 1px solid #16A085;
    border-radius: 6px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition-duration: 0.4s;
    margin: 0; /* 去掉左右外边距 */
  }
  
  button:hover {
    background-color: #16A085;
    border-color: #14967F;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
  }
  
  button#bulk-delete, button#toggle-checkboxes {
    font-size: 16px;
    background-color: #e74c3c;
    border-color: #c0392b;
    margin-top: 10px;
    width: calc(200px + 40px); /* bulk-delete 宽度等于 body 的宽度减去左右内边距再加上两者之间的距离 */
  }
  
  .buttons-wrapper {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-top: 10px;
  }
  
  .buttons-row button {
    width: 120px; /* 将 remove-checkboxes 和 add-checkboxes 按钮的宽度增加到 120px */
  }
  
  .buttons-row button:first-child {
    margin-right: 10px; /* 添加一个右外边距来增加两个按钮之间的距离 */
  }
  
  .footer {
    margin-top: 20px;
    width: 100%;
    font-size: 12px;
    text-align: center;
    border-top: 1px solid #ccc;
    padding-top: 10px;
  }

  button#remove-checkboxes {
    background-color: #badb34;
    border-color: #b6b929;
  }

  button#toggle-checkboxes {
    background-color: #2287da;
    border-color: #2758ab;
  }