body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #fff;
  text-align: center;
}
.container {
  padding: 10px;
}
.main-img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}
.btn-group {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: space-around;
  padding: 12px;
  background: rgba(255,255,255,0.95);
  border-top: 1px solid #ddd;
}
.btn {
  flex: 1;
  margin: 0 5px;
  padding: 14px;
  text-decoration: none;
  font-size: 16px;
  font-weight: bold;
  border-radius: 6px;
  text-align: center;
  color: #fff;
}
.btn-green {
  background: #25D366;
}
.btn-blue {
  background: #007bff;
}