body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

header, nav, section, article, aside, footer {
  padding: 20px;
  max-width: 1200px;
  margin: auto;
}

header {
  background-color: #333;
  color: white;
  text-align: center;
  border-bottom: 4px solid #555;
}

nav ul {
  display: flex;
  gap: 15px;
  background: #1d1d1d;
  list-style: none;
  padding: 10px;
  margin: 0;
  border-top: 2px solid #444;
  border-bottom: 2px solid #444;
}

nav ul li {
  float: left;
}

nav ul li a {
  color: white;
  text-decoration: none;
  padding: 8px 12px;
  display: block;
}

section {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  clear: both;
  padding: 20px;
}

article {
  flex-basis: 60%;
  min-width: 300px;
  padding: 15px;
  border: 1px solid #ccc;
  background-color: #fafafa;
  position: relative;
}

aside {
  flex-basis: 30%;
  min-width: 250px;
  background-color: #f9f9f9;
  padding: 20px;
  border-left: 3px solid #ccc;
  margin-top: 20px;
}

footer {
  background-color: #222;
  color: white;
  text-align: center;
  padding: 15px;
  margin-top: 40px;
  border-top: 3px solid #444;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin-top: 10px;
  border: 1px solid #ccc;
}