body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
  }
  
  header {
    background-color: #f1f3f4;
    padding: 10px;
    border-bottom: 1px solid #ccc;
  }
  
  .menu-bar {
    padding: 5px 10px;
    font-weight: bold;
  }
  
  .toolbar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    padding: 8px 10px;
  }
  
  .toolbar button, .toolbar select {
    margin: 4px;
    padding: 6px 10px;
    font-size: 14px;
    cursor: pointer;
    border-radius: 4px;
    border: 1px solid #ccc;
    background-color: #fff;
  }
  
  #editor {
    margin: 20px auto;
    width: 80%;
    min-height: 500px;
    padding: 20px;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.05);
    outline: none;
    overflow-y: auto;
  }