to.css

body {
    font-family: Arial, sans-serif;
    background-color:orange;
  }
  
  .container {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    background-color: yellowgreen;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  }
  
  h1 {
    text-align: center;
  }
  
  input[type="text"] {
    width: 375px;
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid white;
    border-radius: 5px;
  }
  
  button {
    display: block;
    width: 100%;
    padding: 10px;
    background-color: purple;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  button:hover {
    background-color: blue;
  }
  
  ul {
    list-style: none;
    padding: 0;
  }
  
  li {
    margin-bottom: 5px;
  }
  
  .completed {
    text-decoration: line-through;
    color: grey;
  }