.bandeau_fix {
    display: flex;
    background-color: black;
    margin: -8px -8px 0px -8px;
    font-size: 18px;
}
.bouton {
    margin: auto;
    padding: 12px 14px;
    color: white; 
}
.bouton:nth-child(1){
    background-image:linear-gradient(to bottom, grey 0%, black 60%);
}

.bouton:nth-child(2){
    background-image: linear-gradient(to bottom, #33ff33 0%, #009900 50%);
    margin-right: 0;
}
.bouton:nth-child(2):hover{
    background-image: linear-gradient(to top, #33ff33 0%, #009900 50%);
    margin-right: 0;
}
.bouton:nth-child(3){
    background-image:linear-gradient(to bottom, grey 0%, black 60%);
    margin-left: 0;
}
.bouton:nth-child(3):hover{
    background-image:linear-gradient(to top, grey 0%, black 60%);
    margin-left: 0;
}
a{
    text-decoration: none;   
}
nav{
    display:flex;
    margin:auto;
    margin-top: 15px;
    flex-wrap: wrap;
    color: black;
    font-size: 25px;
    max-width: 900px;
    justify-content: center;
}
.lien_nav{
    padding: 7px 16px 7px 16px;
    border: 1px solid black;
    background-color:#CCA300;
    min-width: 125px;
    text-align:center;
    color:black;
}
.lien_nav_p{
    padding: 10px 16px 7px 16px;
    border: 1px solid black;
    background-color: #8000ff;/*#6600cc;#934ddd;*/
    color:black; 
    font-size: 18px;
}
.lien_nav:hover{
    background-color:#FFcc00;
}
.lien_nav_p:hover{
    background-color:#ed7dd3;
}