<html><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>.avatar { vertical-align: middle; width: 50px; height: 50px; border-radius: 50%;}</style></head><body><h2>头像图片</h2><img src="img_avatar.png" alt="头像" class="avatar"><img src="img_avatar2.png" alt="头像" class="avatar"></body></html>