nav{
    position: fixed;
    z-index: 100;
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: center;
    background-color: var(--gris1);
    box-shadow: 0 5px 5px rgb(0 0 0 / 10%);
    min-height: 10vh;
}

.menu_principal{
    position: relative;
    width: 85%;
    display: flex;
    flex-direction: row;
    justify-items: center;
    align-items: center;
    justify-content: center;
    margin-bottom: 0;
    padding-left: 0;
}
.onglet_principal{
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: var(--typo2);
    line-height: var(--hauteurligne);
    font-weight: bold;
    width: 20%;
    height: 100%;
    text-align: center;
    color: var(--bleu);
    padding: 2px;
}
.onglet_principal:hover{
    background-color: var(--gris2);
}

.logo_nav{
    display: flex;
    align-items: center;
    width: 10%;
    margin: 5px;
}
.logo_nav img{
    width: 100%;
    height: unset;
}
.sous_menu{
    display: none;
    width: 100%;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--gris2);
    padding: 10px;
    text-align: left;
    z-index: -10;
}
.onglet_principal:hover>.sous_menu{
    display: flex;
}
.liste_formation{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}
.sous_onglet{
    padding: 2vh;
    width: 50%;
}

.nom_formation{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    padding: 5px;
    color: var(--gris3);
}
.nom_formation a{
    color: var(--gris3);
}
.nom_formation:hover{
    background-color: var(--bleu);
    border-radius: 5px;
    transition: 0.5s ease;
}
.last:hover{
    background-color: var(--gris3);
    transition: 0.5s ease;
    border-radius: 5px;
}
.burger{
    display: none;
    align-items: center;
    position: absolute;
    left: 20px;
    color: var(--bleu);
    height: 100%;
    font-size: 30px;
}
@media only screen and (max-width: 840px){
    .menu_principal{
        display: none;
    }
    .burger{
        display: flex;

    }
    .onglet_principal{
        width: 100%;
        justify-content: flex-start;
        margin-bottom: 5px;
        text-align: left;
        position: relative;
    }
    .sous_menu{
        flex-wrap: wrap;
        z-index: 1000;
    }
    .logo_nav{
        width: 20%;
    }
   .sous_onglet{
    padding: 1vh;
    width: 100%;
    font-size: xx-small;
   }
}
@media  screen and (max-width: 500px){
    .logo_nav{
        width: 25%;
    }
}
.small_nav{
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    background-color:#E5E5E5;
    width: 100%;
    padding: 20px;
}