body {
  margin: 0;
  font-family: sans-serif;
  text-align: center;
}

header {
  padding: 100px 20px;
  background: #1F3D7A;
  color: white;
}

button {
  padding: 12px 24px;
  border: none;
  background: white;
  color: #1F3D7A;
  font-weight: bold;
  cursor: pointer;
}