.conteneur-flexible{
    display: flex;
    font-size: 20px;
    background-color: #0AD; /*Bleu*/
    border: 2px solid blue;
    box-sizing: border-box;
    margin: 10px 0px;
    height: 250px;
}
.ligne{
    flex-flow: row nowrap;
}
.colonne{
    flex-flow: column nowrap;
}
.element-flexible{
    flex-basis: 40%;
    flex-grow: 1;
    flex-shrink: 1;
    background-color: #0DA; /*Vert*/
    padding: 10px 0px;
    text-align: center;
    border: 2px solid green;
    box-sizing: border-box;
    margin: 5px;
}

.dim .element-flexible{
    width: 50%;
    height: 50%;
}
.ef60{flex-basis: 60%;}
.fs0{flex-shrink: 0;}
.fs1{flex-shrink: 1;}
.fs3{flex-shrink: 3;}