body {
  font-family: Arial, sans-serif;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

form {
  display: flex;
  margin-bottom: 20px;
}

input[type="text"] {
  flex: 1;
  padding: 10px;
  font-size: 16px;
  border-radius: 4px;
  border: none;
}

button[type="submit"] {
  background-color: #4CAF50;
  color: white;
  padding: 10px 20px;
  border-radius: 4px;
  border: none;
  margin-left: 10px;
  cursor: pointer;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

li {
  padding: 10px;
  background-color: #f2f2f2;
  margin-bottom: 10px;
  border-radius: 4px;
  position: relative;
}

li .delete-button {
  position: absolute;
  top: 8px;
  right: 5px;
  background-color: #f44336;
  color: white;
  padding: 5px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
}

li.checked {
  background-color: #4CAF50;
  color: white;
}

li.checked .delete-button {
  background-color: #fff;
  color: #4CAF50;
}

.update-button{
  position: absolute;
  top: 8px;
  right: 70px;
  background-color: white;
  color: #4CAF50;
  padding: 5px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
}


@media (max-width: 480px) {
  form {
    flex-direction: column;
  }

  input[type="text"] {
    margin-bottom: 10px;
  }
}