._70pourcent {
    width:70%;
}
._50pourcent {
    width:50%;
}
._30pourcent {
    width:30%;
}

._flex {
    display: flex;
}
._column {
    flex-direction: column;
}
._row {
    flex-direction: row;
}
._align-center {
    align-items: center;
}