jquery table header agnostic of scroll

.header-fixed {
    width: 100% 
}

.header-fixed > thead,
.header-fixed > tbody,
.header-fixed > thead > tr,
.header-fixed > tbody > tr,
.header-fixed > thead > tr > th,
.header-fixed > tbody > tr > td {
    display: block;
}

.header-fixed > tbody > tr:after,
.header-fixed > thead > tr:after {
    content: ' ';
    display: block;
    visibility: hidden;
    clear: both;
}

.header-fixed > tbody {
    overflow-y: auto;
    height: 150px;
}

.header-fixed > tbody > tr > td,
.header-fixed > thead > tr > th {
    width: 20%;
    float: left;
}