body {
  margin: 0;
  font-family: Arial, sans-serif;
}

.banner-container {
  text-align: center;
}

.banner-container img {
  width: 100%;
  max-width: 960px;
  height: auto;
  cursor: pointer;
}

.popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #000;
  color: #fff;
  padding: 20px;
  text-align: left;
  border-radius: 30px;
  border: 3px solid;
  border-image: linear-gradient(to right, purple, blue);
  border-image-slice: 2;
  max-width: 80%;
}

#close-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 5px;
  background: none;
  border: none;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
}

.popup-content {
  max-height: 70vh;
  overflow-y: auto;
}

.popup-content h2,
.popup-content h3,
.popup-content p {
  margin: 10px 0;
}

.popup-content ul {
  margin: 10px 0;
  padding-left: 20px;
}

.popup-content ul li {
  margin-bottom: 10px;
}