body {
  background-image: url('img/puzzles.jpg');
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;  
  background-color: #f0f8ff;
  font-family: 'Indie Flower', cursive;
  color: #333;
}

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

header {
  background-color: #00BFFF;
  color: #fff;
  padding: 10px;
  text-align: center;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  background-color: #87CEFA;
  border-radius: 5px;
  overflow: hidden;
}

nav ul li {
  margin: 0;
}

nav ul li a {
  display: block;
  padding: 10px 20px;
  text-decoration: none;
  color: #333;
}

nav ul li a:hover {
  background-color: #00BFFF;
  color: #fff;
}

main {
  margin-top: 20px;
  text-align: center;
}

.image-gallery {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin: 0 auto;
  max-width: 800px;
}

.image-gallery img {
  width: 200px;
  height: 200px;
  margin: 10px;
  cursor: pointer;
}

.image-popup {
  display: none;
  position: fixed;
  z-index: 9999;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
}

.popup-image {
  display: block;
  max-width: 90%;
  max-height: 80%;
  margin: 0 auto;
  margin-top: 5%;
}

.close-button {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 30px;
  font-weight: bold;
  color: #fff;
  cursor: pointer;
}

footer {
  background-color: #4CAF50;
  color: #fff;
  padding: 10px;
  text-align: center;
}

.bold-text {
  font-weight: bold;
}

img.qr-code {
  display: block; /* make sure the image is a block element */
  margin-left: auto;
  margin-right: auto;
}

.center {
  text-align: center;
}

.message-box {
  height: 500px;
  width: 100%; /* adjust this value as needed */
}