body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  padding: 2em;
  text-align: center;
}
.container {
  background: white;
  padding: 2em;
  border-radius: 10px;
  display: inline-block;
}
input {
  width: 300px;
  padding: 0.5em;
}
button {
  margin-top: 1em;
  padding: 0.5em 1em;
}