body {
    font-family: Arial, sans-serif;
    background-color: #000000;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
  }

  .container {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 0px 15px rgba(0, 0, 0, 0.1);
    width: 350px;
  }
  
  h1 {
    text-align: center;
    margin-bottom: 20px;
  }
  
  .input-container {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
  }
  
  #new-task {
    width: 75%;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ddd;
  }
  
  #add-task-btn {
    padding: 10px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  #add-task-btn:hover {
    background-color: #218838;
  }
  
  ul {
    list-style: none;
    padding: 0;
  }
  
  li {
    background: #f9f9f9;
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid #ddd;
  }
  
  li.completed {
    text-decoration: line-through;
    background-color: #e0e0e0;
  }
  
  button.remove-btn {
    background-color: #dc3545;
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
  }
  
  button.remove-btn:hover {
    background-color: #c82333;
  }