body {
      font-family: Arial, sans-serif;
      max-width: 400px;
      margin: 40px auto;
      padding: 20px;
      background: black;
      border: 1px solid white;
      color: white;
      border-radius: 10px;
    }
    h2 {
      text-align: center;
    }
    #taskInput {
      width: 70%;
      padding: 8px;
      outline: none;
      border: none;
      color: black;
    }
    #addBtn {
      padding: 8px 12px;
      margin-left: 8px;
      outline: none;
      border: none;
    }
    ul {
      list-style-type: none;
      padding: 0;
    }
    li {
      padding: 8px;
      margin-top: 8px;
      background: #fff;
      border: 1px solid #ccc;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-radius: 5px;
      color: black;
    }
    li.completed {
      text-decoration: line-through;
      color: gray;
    }
    .removeBtn {
      background: red;
      color: white;
      border: none;
      padding: 4px 8px;
      cursor: pointer;
      border-radius: 5px;
    }