body {
  margin: 0;
  font-family: sans-serif;
  background-color: #f0f0f0;
  text-align: center;
  padding: 20px;
}

.container {
  max-width: 500px;
  margin: auto;
}

h1 {
  font-size: 2em;
  margin-bottom: 0.2em;
}

.subtitle {
  font-size: 1.2em;
  margin-bottom: 2em;
}

.button {
  display: inline-block;
  padding: 15px 25px;
  margin: 10px 0;
  font-size: 1em;
  border-radius: 8px;
  text-decoration: none;
  color: white;
  width: 100%;
  box-sizing: border-box;
}

.green {
  background-color: #28a745;
}

.grey {
  background-color: #555;
}

.button .big-text {
  font-size: 1.2em;
  font-weight: bold;
}

.button .small-text {
  font-size: 0.9em;
  opacity: 0.8;
}

.chiikawa-img {
  max-width: 100%;
  border-radius: 12px;
  margin-top: 20px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}