body {
  font-family: system-ui, sans-serif;
  background: #f6f7f9;
  margin: 0;
  padding: 16px;
}

h1 {
  text-align: center;
}

section {
  background: #fff;
  margin-bottom: 16px;
  border-radius: 12px;
  padding: 12px;
}

.item {
  display: flex;
  gap: 12px;
  padding: 10px;
  border-bottom: 1px solid #eee;
  align-items: center;
}

.item:last-child {
  border-bottom: none;
}

.item.done {
  opacity: 0.6;
  text-decoration: line-through;
}

button {
  font-size: 20px;
  border: none;
  background: none;
  cursor: pointer;
}