body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  text-align: center;
  padding: 2rem;
}

h1 {
  margin-bottom: 1.5rem;
}

.input-container {
  margin-bottom: 2rem;
}

input {
  padding: 0.5rem;
  font-size: 1rem;
  width: 60%;
  max-width: 300px;
}

button {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  margin-left: 0.5rem;
  background-color: #0077ff;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

ul {
  list-style: none;
  padding: 0;
  max-width: 400px;
  margin: auto;
}

li {
  background: white;
  margin-bottom: 0.5rem;
  padding: 0.75rem;
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

li.completed {
  text-decoration: line-through;
  color: gray;
}

.delete-btn {
  background: crimson;
  color: white;
  border: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
}