.content {
  width: 65%;
  border: 1px solid #000000;
  padding: 1em 1%;
}
.menu {
  position: absolute;
  top: 1em;
  right: 1%;
  border: 1px solid #000000;
  padding: 1em;
  width: 20%;
}
html>body .menu {
  position: fixed;
}