a {
    text-decoration: none;
    font-size: 1em;
    color: azure;
}

#BoiteBoutNav {
    width: 100%;
    text-align: center;
    order: 1;
    flex-basis: 100vw;
    height: 5em;
    position: fixed;
    top: 1em;
    left: 0;
}

/*Boutons navigation accueil etc...*/
.StyleBoutonVign {
    display: inline-block;
    background-color: rgba(200, 200, 200, 0.5);
    padding: 5px;
    text-align: center;
    border: 0.1em solid;
    border-color: white;
    border-radius: 15em;
}

/*Utilise les StyleBouton1 et 2 " */
#BoiteMenu {
    width: 60%;
    margin-left: 30%;
    margin-top: 45vh;
    display: inline-block;
}

/* Sera valable pour tous les enfants directs de BoiteMenu*/
#BoiteMenu > div {
    display: flex;
    justify-content: space-between;
}

.StyleBouton1 {
    font-size: 1.5em;
    background-color: rgba(135, 135, 135, 0.7);
    text-align: center;
    padding: 0.2em;
    border: 0.1em solid;
    border-color: white;
    text-transform: uppercase;
    border-radius: 10em;
}

.StyleBouton2 {
    font-size: 1em;
    background-color: rgba(135, 135, 135, 0.6);
    text-align: center;
    padding: 0.5em;
    border: 0.1em solid;
    border-color: white;
    border-radius: 10em;
}

.Interligne {
    margin-top: 2.7em;
}

/* SmartphoneVertical max 480 px*/
@media screen and (max-width :29.990em) and (orientation : portrait) {
    body {
        background-image: url("IMAGES/TRIO/TRIO-IV-488-1000-N3.JPG");
    }

    #TexteIH {
        display: none;
    }

    #BoiteMenu {
        width: 80%;
        margin-left: 10%;
        margin-top: 25vh;
    }
}

/* Smartphone horizontal  max 820px */
@media screen and (max-width :51.259em) and (orientation : landscape) {
    body {
        background-image: url("IMAGES/TRIO/TRIO-IH-850-550-N3.JPG");
    }

    #BoiteBoutNav {
        display: none;
    }

    #BoiteMenu {
        display: none;
    }

    #TexteIH {
        width: 80%;
        margin-left: 10%;
        margin-top: 15vh;
        text-align: left;
        font-size: 1.5em;
        color: azure;
    }
}

/* TabletVertical  min 481px*/
@media screen and (min-width : 29.991em) and (orientation : portrait) {
    body {
        background-image: url("IMAGES/TRIO/TRIO-TV-770-1025-N3.JPG");
    }

    #TexteIH {
        display: none;
    }

    #BoiteMenu {
        width: 80%;
        margin-left: 10%;
        margin-top: 30vh;
    }
}

/* Tablet horizontal et small pc - min 821px max 1280px */
@media screen and (min-width : 51.260em) and (max-width :80em) and (orientation : landscape) {
    body {
        background-image: url("IMAGES/TRIO/TRIO-TH-1280-850-N3.JPG");
    }

    #TexteIH {
        display: none;
    }

    #BoiteMenu {
        width: 50%;
        margin-left: 25%;
        margin-top: 20vh;
    }
}

/* Grand Ecran horizontal- 1280px */
@media screen and (min-width : 80.001em) and (orientation : landscape) {
    body {
        background-image: url("IMAGES/TRIO/TRIO-BIG-1900-1342-N3.JPG");
    }

    #TexteIH {
        display: none;
    }

    #BoiteMenu {
        width: 40%;
        margin-left: 35%;
        margin-top: 40vh;
    }
}

/* Si modif css particulier à un type d ecran le redefinir dans le #media ad hoc */
/* le media query peur également se faire dans le general 
*/