#banniere {
    background-image: url(https://www.carolinegiroux.com/wp-content/uploads/2018/09/banniere-cgd5.jpg);
    background-repeat: no-repeat;
    height: 587px;
    background-size: cover;
    overflow: hidden;
}

#banniere .content .banniere-couleur {
    display: none;
}