#master
{
    display: flex;
}
#fond
{
    position: relative;
    float: right;
}
#principal
{
    position: relative;
    float: left;

}
.centreText
{
    min-height: 10em;
    text-align: center;
    margin: 10%;
    font-size: large;
}
.centreTextBis
{
    min-height: 10em;
    text-align: left;
    margin: 5%;

}
body
{
    margin-top: 100px;
    margin-left: 5px;
    margin-right: 5px;
}