.ContentBlock {
    width: 1000px;
    margin: 0px auto;
}
.Partenaires {
    background: #fff;
    width: 1000px;
    border-top: 1px solid #4d54a4;
    margin-top: 20px;
}
.Partenaires .titre_Principal {
    color: #fff;
    font-family: Segoe UI;
    font-size: 20px;
    font-weight: lighter;
    background: #4d54a4;
    padding: 10px 0;
    width: 155px;
    text-align: center;
}
.logo_partenaires{
    float: left;
    max-width: 300px;
    max-height: 200px;
    margin: 0 auto;
    text-align: center;
    display: block;
    border: 1px solid;
    min-width: 300px;
    min-height: 200px;
    margin-right: 30px;
    margin-bottom: 30px;
}
.logo_partenaires:hover{border: 1px solid #2f3193;}
.logo_partenaires:nth-child(3n+3){

margin-right:0;
}
.logos {
    width: 966px;
    margin: 20px auto;
}