tbody scrollbar und table-layout: auto?

gibt es eine Möglichkeit, dass ich innerhalb des tbody scrolle, obwohl das table-layout: auto ist?
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Der hier verwendete Code

<script src="/js_webseite/jquery.js"></script> <style> .content{ font-size:50px; height:1400px; } .header { position: absolute; top: 300px; left: 0px; width: 100%; font-size:55px; background:#123456; color:#fff; z-index: 1000; height: 100px; overflow: hidden; text-align:center; } .header.fest { height: 100px; position:fixed; top:0px; left:0px; } </style> <div class="header"> Header </div> <div class="content"> lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lor lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum em ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsumlorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lor lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum em ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum </div> <script> var shrinkHeader = 300; $(window).scroll(function() { var scroll = getCurrentScroll(); if ( scroll >= shrinkHeader ) { $('.header').addClass('fest'); } else { $('.header').removeClass('fest'); } }); function getCurrentScroll() { return window.pageYOffset || document.documentElement.scrollTop; } </script>