.tree {
  --spacing: 1.5rem;
  --radius: 10px;
}

.vittu {
 background-color: lemonchiffon; }


.perse {
 background-color: azure; }


.infoclass {
 background-color: white; }


.tree li {
  display: block;
  position: relative;
  padding-left: calc(2 * var(--spacing) - var(--radius) - 2px);
}

.tree aa {color: red;}

.tree nf {color: blue;}

.tree ng {color: darkgreen;}

.tree sso {color: brown;}

.tree ul {
  margin-left: 10;
  padding-left: 120;
  color: black;
}