:root {
  --bg-colour: #C2E9FBd6;
  --sidebar-colour: #00AAFFb5;
  --text-colour: #2B2D42;
  --highlight-colour: #005BEAe6;
}

.oc-cont { background-image: url('bg.jpg'); }
.oc-avatar { background-image: url('xxxx'); }