.centrer {
    width: 50%;
    margin: 0 auto;
}

.bouton {
    width: 100%;
    font-size:  2.5em;
    margin: 15px 15px 15px 15px;
}

.section {
    width: 50%;
    background-color: pink;
}

.coinsupgauche {
    position: absolute;
    left: 0px;
    top:  0px;
    background-color: black;
    color: white;
}

.coinsupgauche a {
    color: white;
    font-family: Helvetica;
    font-weight: bold;
}

.coinsupdroit {
    position: absolute;
    right: 0px;
    top:  0px;
    background-color: black;
    color: white;
}

.coinsupdroit a {
    color: white;
    font-family: Helvetica;
    font-weight: bold;
}

.app {
    font-size: 4vw;
}

.app button {
    font-size: 4vw;
}

.heure, .user {
    margin-right: 10px;
    float: left;
}


.msg-c {
    background-color: lavender;
}

.msg-p {
    background-color: lightblue;
}