body {
  margin: 0;
  height: 100vh;
  background: #eef2f7;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Arial;
}

.container {
  width: 400px;
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0,0,0,.15);
  text-align: center;
}

input {
  width: 100%;
  padding: 8px;
  margin-bottom: 8px;
}

button {
  width: 100%;
  padding: 8px;
  margin-bottom: 8px;
  border: none;
  border-radius: 6px;
  background: #4caf50;
  color: white;
  cursor: pointer;
}

.summary {
  margin-top: 10px;
  font-weight: bold;
}