nav{
    display: flex;
    margin: 0;
    justify-content: center;
    background-color: #2ecc71;
}

h2 {
    text-align: center;
    --bleu: #3498db;
}

#navbar-logo img {
    position: relative;
    left: 640px;
    top: 30px;   
   
}

#navbar-logo div {
    background-color: black;
}