Code Guru fix

    .mainCol .userGroup {
        height: auto;
    }

    .mainCol .userGroup:after {
        content: ".";
        display: block;
        clear: both;
        visibility: hidden;
        line-height: 0;
        height: 0;
    }

    .mainCol .singleUser {
        -moz-transition: height 1s;
        -webkit-transition: height 1s;
        -o-transition: height 1s;
        -transition: height 1s;
    }

    .mainCol .singleUser:hover {
        height: 15em;
    }