* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f2f2f2;
  padding: 30px;
  display: flex;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: 500px;
  background-color: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

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

.input-section {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

#task-input {
  flex-grow: 1;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

#add-btn {
  padding: 10px 20px;
  background-color: #4caf50;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

#add-btn:hover {
  background-color: #45a049;
}

ul {
  list-style-type: none;
}

li {
  padding: 10px;
  margin-bottom: 10px;
  background-color: #eee;
  border-radius: 5px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

li.completed {
  text-decoration: line-through;
  color: #999;
}

.remove-btn {
  background-color: #ff4d4d;
  border: none;
  color: white;
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
}

.remove-btn:hover {
  background-color: #e60000;
}