body {
    background-color:darkslategrey;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    color:aliceblue;
    background-image: url("image_ressources/background.png");
    background-repeat: repeat;
    background-size: 20vh;
}

.barre {
    height:2rem;
    background-color:rgba(17,16,25,50%);
}