<html lang="ja"> <meta charset="utf-8"> <style> .ボタン{position:absolute; top:100px; left:100px; background-color:black; color:white; padding:10px 20px; border:none; border-radius:6px; font-size:16px; cursor:pointer;} </style> <button class="ボタン">バウンス</button> </html>