body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    background-color: #f5f5f5;
  }
  
  header {
    background-color: #222;
    color: white;
    padding: 20px;
    text-align: center;
  }
  header {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  main {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
  }
  
  section {
    background: white;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
  }
  
  footer {
    text-align: center;
    padding: 20px;
    color: #666;
  }
  
  button {
    padding: 10px 16px;
    border: none;
    background-color: #222;
    color: white;
    cursor: pointer;
    border-radius: 6px;
    margin-top: 10px;
  }
  
  button:hover {
    background-color: #444;
  }
  
  ul {
    padding-left: 20px;
  }
  
  li {
    margin-bottom: 8px;
  }

  input {
    padding: 8px;
    width: 60%;
    margin-top: 10px;
  }
  
  #notesList {
    margin-top: 15px;
  }
  
  #notesList li {
    background: #fff;
    padding: 3px;
    margin-bottom: 2px;
    border-radius: 4px;
  }
  
  #notesList li {
    cursor: pointer;
  }
  
  #notesList li:hover {
    opacity: 0.8;
  }
  
  input {
    border: 1px solid #ddd;
    border-radius: 6px;
  }
  
  section p {
    color: #555;
  }
  
  #addNoteBtn {
    margin-left: 8px;
  }