body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f9f9f9;
  }
  
  #app {
    max-width: 600px;
    margin: 0 auto;
    background: #fff;
    padding: 20px;
    box-shadow: 0px 2px 5px rgba(0,0,0,0.1);
    border-radius: 8px;
  }
  
  h1 {
    text-align: center;
    margin-bottom: 20px;
  }
  
  .input-container {
    display: flex;
    gap: 10px;
  }
  
  input[type="text"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
  }
  
  button {
    background-color: black;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
  }
  
  button.delete {
    background-color: red;
  }
  
  button:hover {
    opacity: 0.8;
  }
  
  .tasks {
    list-style-type: none;
    padding: 0;
  }
  
  .tasks li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #ddd;
  }
  
  .task-actions,
  .edit-actions {
    display: flex;
    gap: 10px;
  }
  
  .completed {
    text-decoration: line-through;
    color: gray;
  }
  
  .completed {
    text-decoration: line-through;
    color: gray;
  }