body, html {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Roboto', sans-serif;
  background-color: white;
}

.content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

#mainImage {
  width: 400px; /* Set image width to 400px */
  height: auto;
  margin: 0 auto 20px auto; /* Centrally align image */
}

p {
  color: gray;
  font-size: 1em;
  margin: 10px 0;
}

#couponCode {
  padding: 10px;
  margin-bottom: 10px;
  border: 2px solid gray;
  border-radius: 5px;
}

button {
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  color: white;
  background-color: #4CAF50;
  cursor: pointer;
  font-weight: bold;
}

button:hover {
  background-color: #45a049;
}

#message {
  color: gray;
  font-size: 1.2em;
  margin: 20px 0;
}

.course-link {
  color: #4CAF50;
  text-decoration: none;
  font-weight: bold;
  font-size: 1.3em;
}