ul.thumbnails.image_picker_selector {
    overflow: auto;
    list-style-image: none;
    list-style-position: outside;
    list-style-type: none;
    padding: 0px;
    margin: 0px;
}


    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 {
        width:100%;
    } 

    ul.thumbnails.image_picker_selector li.group_title {
        float: none;
    }

    ul.thumbnails.image_picker_selector li {
        /*margin: 0px 12px 12px 0px;*/
        float: left;
    }

        ul.thumbnails.image_picker_selector li .thumbnail {
            float:left;
	        position:relative;

            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
        }

            ul.thumbnails.image_picker_selector li .thumbnail img {
                -webkit-user-drag: none;
                position: absolute;
                margin: auto;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                max-width: 100%;
                max-height: 100%;
            }
            

.check-overlay {
    display: none;
    /*display: block;*/ 
    left: 0px; 
    top: 0px;
    background-image: url('../img/check-blue-small.png');
    background-repeat: no-repeat;
    background-position: top right; 
    z-index:4;
	position:absolute;
	width:100%;
	height:100%;
}
    .check-overlay.selected {
        display: block;
    }