body {
    font-family: Arial, sans-serif;
    background: #f8f9fa;
    padding: 40px;
    text-align: center;
  }
  
  .app {
    background: white;
    max-width: 400px;
    margin: auto;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 10px #ccc;
  }
  
  input {
    padding: 10px;
    width: 70%;
    margin-right: 10px;
  }
  
  button {
    padding: 10px 15px;
    background-color: #4e54c8;
    color: white;
    border: none;
    cursor: pointer;
  }
  
  ul {
    list-style: none;
    padding: 0;
    margin-top: 20px;
  }
  
  li {
    text-align: left;
    padding: 8px;
    border-bottom: 1px solid #ddd;
  }