body {
    max-height: 100%;
    display: grid;
    grid-template-columns: 3% 20% 4% 70% 3%;
    grid-template-rows : 5% 10% 80% 5%;
}
/* ___________________________________________________________________________ */
/* ___________________________________________________________________________ */

#back{
    grid-column : 1;
    grid-row : 1;
}


/* ___________________________________________________________________________ */
/* ___________________________________________________________________________ */

#conteneur{
    max-height: 80%;
    grid-column : 2 / span 3;
    grid-row : 3;
}

/* ___________________________________________________________________________ */
/* ___________________________________________________________________________ */

#button{
    grid-column : 2 / span 3;
    grid-row : 2;

    display: grid;
    grid-template-columns: 7% 20% 13% 20% 13% 20% 7%;
    grid-template-rows: 70% 30%;
}

#oldNew{
    grid-row : 1;
    grid-column : 2;
}

#old{
    grid-row : 1;
    grid-column : 6;
}

#new{
    grid-row : 1;
    grid-column : 4;
}

/* ___________________________________________________________________________ */
/* ___________________________________________________________________________ */