* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #f0f0f5;
}

.todo-container {
  width: 90%;
  max-width: 400px;
  background: white;
  padding: 20px;
  border-radius: 15px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.todo-header {
  display: flex;
  gap: 10px;
}

input {
  flex: 1;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 10px;
  outline: none;
}

button {
  background: #4caf50;
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 16px;
}

.todo-list {
  margin-top: 20px;
}

.todo-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px;
  border-bottom: 1px solid #eee;
}

.todo-item.completed span {
  text-decoration: line-through;
  color: #888;
}

.todo-item input[type="checkbox"] {
  margin-right: 10px;
}

.delete-btn {
  background: none;
  border: none;
  color: red;
  font-size: 20px;
  cursor: pointer;
}