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*/
}
.w50{width: 50px;}
.w100{width: 100px;}
.h50{height:50px;}
.h100{height:100px;}
.h150{height:150px;}

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

.cg{
  clear: left;
}
.cd{
  clear: right;
}
.cleared{
  clear: both;
}