<!DOCTYPE html> <html> <style> fieldset.outer { column-count: 1; transform: translateX(3px); position: relative; width: 100px; height: 50px; border: 1px solid blue; margin: 0; } div.fixed { position: fixed; top: 0; left: 0; background: green; } </style> <!-- ABC should be inside the fieldset since 'transform' creates a stacking context. --> <fieldset class="outer"> <legend>Legend</legend> <div class="fixed">ABC</div> </fieldset> </html>