body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background: #333;
  color: #fff;
  padding: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header nav a {
  color: #fff;
  margin: 0 10px;
  text-decoration: none;
}
.top-section {
  display: flex;
  padding: 20px;
}
.perspectives {
  flex: 3;
  margin-right: 20px;
}
.perspective {
  background: #f4f4f4;
  padding: 15px;
  margin-bottom: 15px;
  border: 1px solid #ddd;
}
aside {
  flex: 1;
  background: #fafafa;
  padding: 15px;
  border-left: 1px solid #ddd;
}
aside h3 {
  margin-top: 0;
}
.page-content {
  padding: 20px;
  border-top: 2px solid #ccc;
}
.page-image {
  padding: 20px;
  text-align: center;
}
.page-image img {
  width: 100%;
  max-height: 250px;
  object-fit: cover;
}
footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 10px;
}