p{
  background-color: #0FA;/*Vert*/
}
.conteneur{
	
  background-color: #0AF;/*Bleu*/
  border: 1px solid black;
  margin: 10px 0px;/*10px de marge haute et basse*/
}
.interne{
  background-color: #DD6;/*Jaune*/
}
.w100{width: 100px;}
.h150{height:150px;}

.gauche{
  float: left;
}
.droite{
  float: right;
}

.clearfix::after{
  content: "";
  display: table;
  clear: both;
}