body {
  margin: 0;
  font-family: sans-serif;
  background: #f6f6f6;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
}

.app-container {
  z-index: 1;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 15px rgba(0,0,0,0.1);
  text-align: center;
}

select, input, button {
  margin: 10px;
  padding: 10px;
  font-size: 16px;
}