tablesort.css

th.tablesort-sortable {
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
    cursor: pointer;
}

table .tablesort-sortable:after{
    content:"";
    float:right;
    margin-top:7px;
    visibility:hidden;
    border-left:4px solid transparent;
    border-right:4px solid transparent;

    border-top:none;
    border-bottom:4px solid #000;
}

table .tablesort-desc:after{
    border-top:4px solid #000;
    border-bottom:none;
}

table .tablesort-asc,table .tablesort-desc{
    background-color:rgba(141, 192, 219, 0.25);
}

table .tablesort-sortable:hover:after, table .tablesort-asc:after, table .tablesort-desc:after {
    visibility:visible;
}

/*
 * Styling for the table row shown in empty tables
 */

/* The row is always added as the first row in a table
   Hide it by default */
.showIfLast {
    display: none;
}

/* Only show it if it is also the last row of the table. */
.showIfLast:last-child {
    display: table-row;
}

.showIfLast td {
    text-align: center;
}