* {
  color: red;
}
p {
  color: green;
}

#alt_saison,
#popoesie u#soleils {
  display: none;
}
li.poem,
li.poem * {
  color:#000;
}
li.poem *:is(u,i) {
  color: rgb(15, 126, 82);
}
/* extra */
#popoesie * { background: cyan; }
#popoesie *:hover { background: yellow; }

/* CORRECTIONS */
a,
#saisons span {
  display: none;
}
#saisons span#alt_saison {
  display: inline-block;
  color: blue;
}
li.poem.last span {
  display: none;
}
#popoesie u#soleils {
  display: inline-block;
}

li.poem *:is(u,i) {
  color: red;
}
p, li, ul {
  margin:0;
  padding: 0;
}