body {
  background: #001010 url('images/bg.gif');
  color: #aaf;
  font-family: 'Courier New', monospace;
}

#container {
  display: flex;
  margin: 20px;
}

#sidebar {
  width: 200px;
  padding: 10px;
  background: rgba(0,0,0,0.5);
  border-right: 2px solid #00ffff;
}

#main {
  flex: 1;
  padding: 20px;
  background: rgba(0,0,0,0.3);
}

a {
  color: #00ffff;
  text-decoration: none;
}
a:hover { text-decoration: underline; }