/*nav portfolio web*/
nav li:nth-child(4) a {
    color: #64bee6;
    background-color: #525251;
}

nav li:nth-child(4) ul li a {
    color: white;
    background-color: #878787;
    border: solid 1px white;
    border-radius: 10px;
}
nav li:nth-child(4) ul li:nth-child(4) a {
    color: #64bee6;
    background-color: #525251;
}

nav li ul li a:hover {
    color: #64bee6;
    background-color: #525251;
}
/*fin nav portfolio web*/

/*Ma section*/

.grostitre {
    margin: 0 auto;
    text-align: center;
    letter-spacing: 0.05em;
}

.cadrepresentation {
    background-color: white;
    display: block;
    position: relative;
    margin-top: 3%;
}

.presentation {
    overflow: hidden;
    margin-bottom: 20px;
    display: inline-block;
    width: 100%;
}

.presentation a {
    width: 18%;
    float: left;
    margin: 1%;
    display: block;
    background-color: white;
    height:260px;
}
.presentation a:hover img {
    opacity: 0.9;
}
.presentation span {
    width: 18%;
    float: left;
    margin: 1%;
    display: block;
    background-color: white;
    height:260px;
}
.presentation span a {
    width: 100%;
    float: left;
    height: auto;
}
iframe {
    width: 100%;
}
.sitefictif:hover {
    color: #64bee6;
    display: block;
}

@media screen and (max-width: 580px) {
    .presentation a {
        width: 100%;
        height:auto;
    }
    .presentation span {
        width: 100%;
        height:auto;
    }
}

.presentation h3 {
    display: inline-block;
    padding-left: 1%;
    width: 100%;
    background-color: white;
}

.presentation img {
    position: relative;
    width: 100%;
    border: 2px solid #ebebeb;
    border-radius: 5%;
}
.box img {
    max-height: 260px;
}

/*fin de ma section*/
@media screen and (max-width: 580px) {
    #presentation img {
        position: relative;
        width: 100%;
    }
    #presentation div {
        position: relative;
        left: 0%;
        width: 100%;
    }
    footer div {
        float: left;
        width: 100%;
        margin: 0% 1% 0% 1%;
        text-align: center;
    }
}