@nice-blue: #5B83AD;
@light-blue: @nice-blue + #111;

// Comment 1
/*
 * Comment 2
 */
#header {
  // Comment 3
  /*
   * Comment 4
   */
  color: @light-blue;
}

@media only screen and (max-width: 600px) {
  // Comment 1
  /*
   * Comment 5
   */
  body {
    background-color: lightblue; // Comment 6
    color: red; /* Comment 7 */
  }
}