.conteneur-flexible{
    display: flex;
    font-size: 20px;
    background-color: #0AD; 
	/*Bleu*/
    border: 2px solid blue;
    box-sizing: border-box;
    margin: 10px 0px;
    height: 150px;
}

.ligne{
    flex-flow: row wrap;
}
.ligne-reverse{
    flex-flow: row wrap-reverse;
}
.debut-sec{
    align-items: flex-start;
}
.fin-sec{
    align-items: flex-end;
}

.element-flexible{
    flex: 0 0 30%;
    width: 25%;
    background-color: #0DA; 
	/*Vert*/
    padding: 10px 0px;
    text-align: center;
    border: 2px solid green;
    box-sizing: border-box;
    margin: 5px;
}
.petit{
  padding: 0px;
}