body {
  font-family: Arial, sans-serif;
  background: #f4f6f8;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 700px;
  margin: auto;
}

.payment-box,
.checker-box {
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  margin-bottom: 20px;
}

h2, h3 {
  text-align: center;
  margin-bottom: 15px;
}

p {
  line-height: 1.5;
}

.note {
  margin-top: 15px;
  font-size: 14px;
  color: #555;
}

input {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

button {
  width: 100%;
  padding: 12px;
  margin-top: 10px;
  background: #2e7d32;
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background: #1b5e20;
}

hr {
  border: none;
  height: 1px;
  background: #ddd;
  margin: 30px 0;
}
.back-btn {
  display: inline-block;
  padding: 10px 15px;
  background: #2e7d32;
  color: white;
  border-radius: 5px;
  text-decoration: none;
}

.back-btn:hover {
  background: #1b5e20;
}
.bottom-back {
  margin-top: 30px;
  text-align: center;
}

.back-btn {
  padding: 10px 15px;
  background: #2e7d32;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.back-btn:hover {
  background: #1b5e20;
}