<!DOCTYPE HTML> <html> <head> <style> fieldset { background:pink; overflow:hidden; height:100px; } legend::after { content:"legend"; } p { background:lime; height:20px; } </style> </head> <body> <fieldset id="f1"><legend></legend><p></p></fieldset> <br> <fieldset id="f2"><legend></legend><p></p></fieldset> <br> <fieldset id="f3"><legend></legend></fieldset> </body> </html>