table.treetable span.indenter {
    display: inline-block;
    margin: 0;
    padding: 0;
    text-align: right;
    /* Disable text selection of nodes (for better D&D UX) */
    user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    -webkit-user-select: none;
    /* Force content-box box model for indenter (Bootstrap compatibility) */
    -webkit-box-sizing: content-box;
    -moz-box-sizing: content-box;
    box-sizing: content-box;
    width: 19px;
}

    table.treetable span.indenter a {
        background-position: left center;
        background-repeat: no-repeat;
        display: inline-block;
        text-decoration: none;
        width: 19px;
    }