.bg-content-medias {
    position: absolute;
    top: 0; 
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: none;
    z-index: 99999;
}

.bg-content-medias .content-medias {
    margin-top: 100px;
    padding: 20px;
    width: 100%;
    background-color: #fff;
}

.bg-content-medias .content-medias ul {
    list-style: none;
}

.bg-content-medias .content-medias ul li {
    float: left;
    width: 25%;
    margin-left: 10px;
}

.bg-content-medias .content-medias ul li img {
    width: 100%;
}