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

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #333;
  color: #fff;
  padding: 10px 20px;
}

header .logo {
  font-size: 24px;
}

header nav ul {
  list-style: none;
  display: flex;
  gap: 15px;
}

header nav ul li {
  display: inline;
}

header nav ul li a {
  color: #fff;
  text-decoration: none;
}

header button {
  background-color: #007BFF;
  color: #fff;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
}

.featured-articles,
.article-list {
  margin-bottom: 20px;
}

aside {
  padding: 20px;
  background-color: #f4f4f4;
}

aside .categories ul {
  list-style: none;
  padding: 0;
}

aside .categories ul li {
  margin-bottom: 10px;
}

aside .categories ul li a {
  text-decoration: none;
  color: #333;
}

footer {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 10px 0;
}

main {
  display: block;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

#pdf-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

#pdf-container canvas {
  margin: 0;
  border: 1px solid #ccc;
}

.navbar-menu {
  position: relative;
}

.navbar-menu:hover .dropdown-content {
  display: block;
}

.dropdown-toggle {
  color: #ffffff;
  cursor: pointer;
  padding: 10px;
  background-color: #444;
  border-radius: 5px;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #666;
  min-width: 200px;
  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2);
  z-index: 1;
  border-radius: 5px;
}

.dropdown-content a {
  color: white;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {
  background-color: #ddd;
  color: black;
}