body {
  background-color: #121212;
  color: #ffffff;
  font-family: sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  padding: 24px;
  box-sizing: border-box;
}

h1 {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 24px;
}

h2 {
  font-size: 1.1rem;
  font-weight: normal;
  color: #aaaaaa;
  text-align: center;
  line-height: 1.5;
  max-width: 440px;
  margin: 0 auto 32px auto;
}

form {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
  max-width: 480px;
}

input, select, button {
  padding: 16px;
  font-size: 18px;
  border-radius: 8px;
  border: 1px solid #333;
  background-color: #1e1e1e;
  color: #fff;
  box-sizing: border-box;
  width: 100%;
}

select {
  appearance: none;
  -webkit-appearance: none;
}

button {
  background-color: #007acc;
  border: none;
  cursor: pointer;
  font-weight: bold;
  font-size: 20px;
  margin-top: 10px;
}

button:hover, button:active {
  background-color: #005999;
}

pre {
  background-color: #1e1e1e;
  padding: 16px;
  border-radius: 8px;
  margin-top: 24px;
  width: 100%;
  max-width: 480px;
  box-sizing: border-box;
  font-size: 16px;
  white-space: pre-wrap;
  word-break: break-all;
}