html, body {
    height: 100%;
    margin: 0;
    overflow: hidden; /* empêche le scroll vertical */
}

.wrapper {
    display: flex;
    flex-direction: column;
    height: 100vh; /* 100% de la fenêtre */
}

main {
    flex: 1;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.jumbotron {
    max-height: 100%;
    overflow: auto;
    text-align: center;
}

img {
    max-height: 500px;
    height: auto;
    width: auto;
}