table.dataTable.dtr-inline.collapsed>tbody>tr[role="row"]>td:first-child:before,
table.dataTable.dtr-inline.collapsed>tbody>tr[role="row"]>th:first-child:before {
    top: 9px;
    left: 4px;
    height: 14px;
    width: 14px;
    display: block;
    position: absolute;
    color: white;
    border: 2px solid white;
    border-radius: 14px;
    box-shadow: 0 0 3px #444;
    box-sizing: content-box;
    text-align: center;
    text-indent: 0 !important;
    font-family: 'Courier New', Courier, monospace;
    line-height: 14px;
    content: '+';
    background-color: #337ab7
}

table.dataTable.dtr-inline.collapsed>tbody>tr.parent>td:first-child:before,
table.dataTable.dtr-inline.collapsed>tbody>tr.parent>th:first-child:before {
    content: '-';
    background-color: #d33333
}