1 <div style="width:200px; height:800px; background:#0FF; position:relative; margin:200px auto;">2 <div style="width:200px; height:100px; background:#00F; position:fixed; margin:0;"></div></div>Enlace
El enlace para compartir es:
1 <div style="width:200px; height:800px; background:#0FF; position:relative; margin:200px auto;">2 <div style="width:200px; height:100px; background:#00F; position:fixed; margin:0;"></div></div>