table.html

<style>
    .header {
        position: fixed;
        height: 12px
        left: 0px;
        top: 0px;
        width: 100%;   
    }

    .table {
        width:  100%;
        height: calc(100% - 12px);
        overflow: scroll;
        position: absolute;
        left: 0px;
        top: 12px;
    }
</style>
<div>
    <div class="header">
        <!-- Header stuff -->
    </div>
    <div class="table">
        <!-- Table Stuff -->
    </div>
</div>