table.table-expandable > tbody > tr:nth-child(odd) {
    cursor: pointer;
}

table.table-expandable.table-hover > tbody > tr:nth-child(even):hover td {
    background-color: white;
}

table.table-expandable.table-hover > thead {
    background-color: #f8f9fa;
}

table.table-expandable > tbody > tr.table-rowclick {
    background-color: #f8f8ff;
    text-align:justify; 
}    

table.table-expandable > tbody > tr div.table-expandable-arrow {
    background:transparent url(http://localhost/webtracnghiem/assets/css/arrows.png) 
        no-repeat scroll 0px -16px; width:16px; height:16px; display:block;
}

table.table-expandable > tbody > tr div.table-expandable-arrow.up {
    background-position:0px 0px;
}