body {
  font-family: Arial, Helvetica, sans-serif;
  background: #f2f4f7;
}

#app {
  max-width: 360px;
  margin: 80px auto;
  background: white;
  padding: 20px;
  border-radius: 6px;
  box-shadow: 0 0 8px rgba(0,0,0,.1);
}

h2 {
  margin-bottom: 10px;
}

input, button {
  width: 100%;
  padding: 8px;
  margin-top: 10px;
}