body {
  font-family: Arial, sans-serif;
  background: #f4f7fb;
  margin: 0;
  padding: 40px;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  background: white;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h1 {
  text-align: center;
}

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

input {
  flex: 1;
  padding: 10px;
}

button {
  padding: 10px 16px;
  cursor: pointer;
}

li {
  background: #eee;
  padding: 10px;
  margin-top: 10px;
  border-radius: 6px;
}