.fixed-table-container {
    position: relative;
}

.fixed-table-container-inner {
    overflow-y: auto;
}

div.fixed-table-container div table thead tr th {
    padding: 0;
    border: 0;
}

.th-inner {
    position: absolute;
    top: 0;
    padding:3px;
    margin-top:0px;
    text-align: left;
    border-left: 1px solid rgb(212, 212, 212);
}
.th-inner-hidden {
    position: absolute;
    top: 0;
    text-align: left;
    border-left: 1px solid rgb(212, 212, 212);
}

.hidden-header .th-inner-hidden {
    position: static;
    overflow-y: hidden;
    height: 0px !important;
}