body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    font-weight: bold;
}
h1 {
    text-align: center;
}
h2, h3, p {
    padding-left: 30px;
}
h3 span, h1 span, p span {
    color: orangered;
}
.conteneur {
    width: auto;
    display: flex;
    flex-flow: row wrap;
    justify-content : space-around;
    align-items: center;

}
.item3 {
    height: 100px;
    width: 100px;
}
#conteneur1 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    /*flex-direction: row;          par défaut*/
    /*flex-wrap: nowrap;            par défaut*/
    /*flex-flow: row nowrap;        par défaut*/
    /*justify-content : flex-start; par défaut, aligner sur axe principale*/
    /*align-items: stretch;         par défaut aligner sur axe secondaire*/
    /*align-content: stretch;       par défaut*/
}
#conteneur1 div {
    /* les items */
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur2 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-wrap: wrap;
}
#conteneur2 div {
    /* les items */
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur3 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-direction: row-reverse;
}
#conteneur3 div {
    /* les items */
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur4 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row-reverse wrap;
}
#conteneur4 div {
    /* les items */
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur5 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    justify-content: flex-end;
}
#conteneur5 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur6 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    justify-content: center;
}
#conteneur6 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur7 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    justify-content: space-around;
}
#conteneur7 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur8 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    justify-content: space-between;
}
#conteneur8 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur9 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    justify-content: space-evenly;
}
#conteneur9 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur10 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-items: start;
}
#conteneur10 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur11 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-items: stretch;
}
#conteneur11 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur12 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-items: center;
}
#conteneur12 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur13 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-items: flex-end;
}
#conteneur13 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur14 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-content: flex-start;
}
#conteneur14 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur15 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-content: flex-end;
}
#conteneur15 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur16 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-content: center;
}
#conteneur16 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur17 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-content: space-between;
}
#conteneur17 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur18 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-content: space-around;
}
#conteneur18 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}
#conteneur19 {
    background-color: orangered;
    border: 2px solid black;
    width: 700px;
    height: 400px;
    margin: 40px;
    display: flex;
    flex-flow: row wrap;
    align-content: space-evenly;
}
#conteneur19 div {
    background-color: orange;
    padding: 20px;
    margin : 10px;
    border: 2px solid black;
}