body {
  font-family: sans-serif;
  background: #0f172a;
  color: #f8fafc;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}
.container {
  background: #1e293b;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
  text-align: center;
}
input, button {
  padding: 0.5rem;
  margin-top: 1rem;
  width: 100%;
  border-radius: 5px;
  border: none;
}
button {
  background: #38bdf8;
  color: #0f172a;
  font-weight: bold;
  cursor: pointer;
}