* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  padding-left: 270px; /* Make space for sidebar */
}

main {
  width: 70%;
  background-color: #f5f5f5;
  padding: 20px;
  margin: 20px auto;
}

/* Absolute sidebar */
aside {
  position: absolute;
  top: 0;
  left: 0;
  width: 250px;
  height: 100%;
  background-color: #333;
  color: white;
  padding: 20px;
  z-index: 10;
}

aside a {
  color: #3498db;
  text-decoration: none;
  display: block;
  padding: 8px 0;
  border-radius: 4px;
}

aside a:hover {
  color: #ecf0f1;
  background-color: #444;
  padding-left: 10px;
}