body {
    margin: calc(50px + 20px) 20px 20px;
    background-color: lavenderblush;
}

h1#titre {
    display: block;
    margin: 0 auto 30px;
    width: max-content;
    font-family: "Lucida Calligraphy", cursive;
    text-decoration: underline;
}

body > div {
    display: flex;
    margin-top: 30px;
    gap: 20px;
}

div#section_logo {
    display: flex;
    flex-grow: 7;
    justify-content: center;
    align-items: center;
    /* ... */
    /* flex-grow: 1; */
}

img#logo {
    display: block;
    height: 33vh;
    width: auto;
}

img#prochain_concert {
    display: block;
    height: 75vh;
    width: auto;
}

div#section_concerts {
    display: flex;
    flex-grow: 6;
    justify-content: center;
    align-items: center;
    /* ... */
    /* flex-grow: 1; */
}

div#section_concerts > div {
    display: flex;
    flex-direction: column;
    gap: 15px;
    /* ... */
    padding-right: 30px;
}

div#section_concerts h2 {
    display: block;
    margin: 0px;
    margin-left: 40px;
    width: max-content;
    font-family: "Times New Roman", serif;
    font-size: larger;
    text-decoration: underline;
}

ul#prochains_concerts {
    display: block;
    margin: 0px;
    /* list-style-type: none; */
    font-family: "Times New Roman", serif;
    font-size: large;
}

ul#prochains_concerts li {
    margin-bottom: 10px;
}

ul#prochains_concerts li:last-child {
    margin-bottom: 0;
}

/* - - - */

@media(max-width: 600px) {

    body {
        margin-top: calc(40px + 20px);
    }

    h1#titre {
        max-width: 100%;
        margin-bottom: 20px;
        /* font-size: x-large; */
        text-align: center;
        text-wrap-style: balance;
    }

    body > div {
        margin-top: 20px;
        flex-direction: column;
    }

    img#logo {
        width: 50%;
        height: auto;
    }

    img#prochain_concert {
        width: 100%;
        height: auto;
    }

    div#section_concerts > div {
        padding: 0px;
        align-items: center;
        gap: 10px;
    }

    div#section_concerts h2 {
        margin: 0px;
        font-size: medium;
    }

    ul#prochains_concerts {
        font-size: medium;
        /* ... */
        padding-right: 40px;
    }

}

/* - - - */

/* body { border: 2px solid black; } */
/* h1#titre { border: 2px solid black; } */
/* body > div { border: 2px solid black; } */
/* div.section { border: 2px solid black; } */
/* img#logo { border: 2px solid black; } */
/* div#section_concerts > div { border: 2px solid black; } */
/* ul#prochains_concerts { border: 2px solid black; } */