test {
  color: red;ss
}

#cibler_adjascent_avance {
  min-height: 400px;

  img {
    height: 400px;
    position: absolute;
    z-index: 2;
  }

  .go_button ~ .default_invisible {
    opacity: 0;
    visibility: hidden;
    img {
      border: 4px solid pink;
   }
  }

  div#last_trigger {
    transition: none;
  }

  /* TOUT .default_invisible Au meme niveau (meme parent) 
  ... que .go_button sera affecté (quand .go_button:hover) */
  .go_button:hover ~ .default_invisible {
    opacity: 1;
    visibility: visible;
    position: absolute;
    img {
      border: 4px solid blue;
   }
  }

  .go_button + div#content_trigger {
    right: 500px;
    z-index: 2;
  }

  /* 2 == #second_trigger */
  .go_button + div 
    + div#second_trigger { 
    right: 300px;
    z-index: 3;
  }

  /* 3 == #last_trigger */
  .go_button:hover + div + div 
    + div#last_trigger { 
    right: 730px;
    margin-right: 350px;
    transition: margin 1s ease 0s, 
                opacity 0s ease 0.1s;
  }
  .go_button ~ .default_invisible &gt; .sub_child {
    position: relative;
    right: -300px !important;
    opacity: 0;
    transition: all 5s ease 0.1s;
  }
  .go_button:hover ~ .default_invisible &gt; .sub_child {
    visibility: visible;
    right: 0 !important;
    opacity: 1;
    transition: all 1s ease 0.1s,
      right 2s ease-out 0s;
    z-index: 1;
  }


  .go_button:hover + div + div 
    + div#last_trigger img {
    outline: 3px solid red;
  }
  .go_button:hover + div + div 
    + div#last_trigger &gt; span &gt;  img[src*="_alt"] {
    outline: 4px solid yellow;
  }
  img[alt="cat_3"] {
    right: 50px;
  }

  .go_button:hover + div + div 
    + div#last_trigger img[src*="_alt"],
  .go_button:hover + div + div
    + div#last_trigger &gt; span &gt; img {
      position: absolute;
      transform: rotateY(180deg);
  }

  .go_button + div + div 
  + div#last_trigger 
  + #trigger_oublie {
    left: 500px;
    bottom: 0;
    opacity: 1;
    visibility: visible;
    position: absolute;

    img {
      position: relative;
      z-index: 0;
      outline: 3px solid yellow;
      height: 300px;
    }
  }
}