p{
  background-color: #0CC;
}
div{
  width: 100px;
  height: 100px;
  display: inline-block;
  border: 1px solid black;
  box-sizing: border-box;
}
.bleu{background-color: #0AF;}
.vert{background-color: #0FA;}

.relatif{position: relative}
.decale{
  right: 75px;
  top: 25px;
}

.z100{
  z-index: 100;
}