ul.thumbnails.image_picker_selector {
    overflow: auto;
    list-style-image: none;
    list-style-position: outside;
    list-style-type: none;
    text-align: center;
    
}
ul.thumbnails.image_picker_selector ul {
    overflow: auto;
    list-style-image: none;
    list-style-position: outside;
    list-style-type: none;
    padding: 0px;
    margin: 0px; 
}
ul.thumbnails.image_picker_selector li.group_title {
    float: none; 
}
ul.thumbnails.image_picker_selector li {
    margin: 0px 6px 12px 0px;
    float: left; 
}
ul.thumbnails.image_picker_selector li .thumbnail {
    padding: 6px;
    border: 1px solid #dddddd;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none; 
    width: 70px;
    height: 70px;
    vertical-align: middle;
}
ul.thumbnails.image_picker_selector li .thumbnail img {
    -webkit-user-drag: none;         
}
ul.thumbnails.image_picker_selector li .thumbnail.selected {
    border: #007bb6 4px solid;    
}