body {
  margin: 0;
  padding: 0;
  font-family: 'Helvetica Neue', sans-serif;
  background: #fff;
  color: #000;
}

.container {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
  text-align: center;
}

h1 {
  font-size: 2.2em;
  margin-bottom: 20px;
}

.instruction {
  font-size: 1.2em;
  margin: 20px 0;
}

.screenshot {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}