.picItem {
    overflow: hidden;
    z-index: 1;
    position: relative;
}

    .picItem:after {
        content: "";
        display: block;
        padding-top: 100%;
    }

    .picItem img {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        margin: auto;
        max-width: 100%;
        max-height: 100%;
    }

.picLogo {
    overflow: hidden;
    z-index: 1;
    position: relative;
}

    .picLogo:after {
        content: "";
        display: block;
        padding-top: 56.25%;
    }

    .picLogo img {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        margin: auto;
        max-width: 100%;
        max-height: 100%;
    }