body {
  font-family: Arial, sans-serif;
  text-align: center;
  margin-top: 50px;
  background-color: #f8f9fa;
}

input {
  padding: 10px;
  width: 200px;
}

button {
  padding: 10px 15px;
  margin-left: 5px;
  cursor: pointer;
}

ul {
  list-style-type: none;
  padding: 0;
  margin-top: 20px;
}

li {
  background: #fff;
  margin: 5px auto;
  padding: 10px;
  width: 250px;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.delete-btn {
  background-color: red;
  color: white;
  border: none;
  padding: 5px 10px;
  border-radius: 5px;
  cursor: pointer;
}

.completed {
  text-decoration: line-through;
  color: gray;
  opacity: 0.7;
}