header, nav#menu {
    position: fixed;
    z-index: 1;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 50px;
}

nav#menu {
    display: flex;
    justify-content: space-between;
    background-color: darksalmon;
    box-shadow: 0 0 5px black;
}

a#lien_accueil,
button#bouton_menu {
    padding: 5px;
    border: none;
    background-color: transparent;
}

a#lien_accueil > img,
button#bouton_menu > img {
    height: 100%;
    width: auto;
    box-sizing: border-box;
}

div#liste_menu {
    display: flex;
    flex-grow: 1;
}

div#liste_menu > a {
    display: block;
    flex-grow: 1;
    text-align: center;
    align-content: center;
    color: black;
    font-size: large;
    font-weight: bold;
    text-decoration: none;
}

button#bouton_menu {
    display: none;
    padding: 10px;
}

nav#menu a:hover,
nav#menu button:hover {
    background-color: rgba(0, 0, 0, 0.2);
    text-decoration: underline;
    cursor: pointer;
}

/* - - - */

@media(max-width: 600px) {

    header, nav#menu {
        height: 40px;
    }

    div#liste_menu {
        overflow: hidden;
        position: fixed;
        top: 40px;
        width: 100%;
        max-height: 0px;
        flex-direction: column;
        background-color: darksalmon;
        transition: max-height 0.5s;
    }

    div#liste_menu.affiche {
        max-height: 250px;
    }

    div#liste_menu > a {
        padding: 10px 0;
    }

    div#liste_menu > a:last-child {
        margin-bottom: 10px;
    }

    button#bouton_menu {
        display: block;
    }

}

/* - - - */

/* a#lien_accueil { border: 2px solid black; } */
/* a#lien_accueil > img { border: 2px solid black; } */
/* div#liste_menu { border: 2px solid black; } */
/* div#liste_menu > a { border: 2px solid black; } */
/* button#bouton_menu { border: 2px solid black; } */
/* button#bouton_menu > img { border: 2px solid black; } */